Cleanup: use single back-tick quoting in comments

While doxygen supports both, conform to our style guide.

Note that single back-tick's are already used in a majority of comments.

source/blender/python/generic/py_capi_utils.c

@@ -525,7 +525,7 @@ PyObject *PyC_FrozenSetFromStrings(const char **strings)
  *
  * Implementation - we can't actually prepend the existing exception,
  * because it could have _any_ arguments given to it, so instead we get its
- * ``__str__`` output and raise our own exception including it.
+ * `__str__` output and raise our own exception including it.
  */
 PyObject *PyC_Err_Format_Prefix(PyObject *exception_type_prefix, const char *format, ...)
 {

source/blender/python/gpu/gpu_py.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_api.c

@@ -20,8 +20,8 @@
  * Experimental Python API, not considered public yet (called '_gpu'),
  * we may re-expose as public later.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_batch.c

@@ -19,11 +19,11 @@
 /** \file
  * \ingroup bpygpu
  *
- * This file defines the offscreen functionalities of the 'gpu' module
+ * This file defines the off-screen functionalities of the 'gpu' module
  * used for off-screen OpenGL rendering.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_buffer.c

@@ -19,8 +19,8 @@
  *
  * This file defines the gpu.state API.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_capabilities.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_element.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_framebuffer.c

@@ -20,8 +20,8 @@
  * This file defines the framebuffer functionalities of the 'gpu' module
  * used for off-screen OpenGL rendering.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_matrix.c

@@ -22,8 +22,8 @@
  * \warning While these functions attempt to ensure correct stack usage.
  * Mixing Python and C functions may still crash on invalid use.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_offscreen.c

@@ -22,8 +22,8 @@
  * This file defines the offscreen functionalities of the 'gpu' module
  * used for off-screen OpenGL rendering.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_platform.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_select.c

@@ -22,8 +22,8 @@
  * \note Currently only used for gizmo selection,
  * will need to add begin/end and a way to access the hits.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_shader.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_state.c

@@ -19,8 +19,8 @@
  *
  * This file defines the gpu.state API.
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_texture.c

@@ -19,8 +19,8 @@
  *
  * This file defines the texture functionalities of the 'gpu' module
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_types.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_uniformbuffer.c

@@ -19,8 +19,8 @@
  *
  * This file defines the uniform buffer functionalities of the 'gpu' module
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_vertex_buffer.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/gpu/gpu_py_vertex_format.c

@@ -17,8 +17,8 @@
 /** \file
  * \ingroup bpygpu
  *
- * - Use ``bpygpu_`` for local API.
- * - Use ``BPyGPU`` for public API.
+ * - Use `bpygpu_` for local API.
+ * - Use `BPyGPU` for public API.
  */
 
 #include <Python.h>

source/blender/python/intern/bpy_utils_units.c

@@ -67,7 +67,7 @@ static const char *bpyunits_ucategorie_items[] = {
 /**
  * These fields are just empty placeholders, actual values get set in initializations functions.
  * This allows us to avoid many handwriting, and above all,
- * to keep all systems/categories definition stuff in ``BKE_unit.h``.
+ * to keep all systems/categories definition stuff in `BKE_unit.h`.
  */
 static PyStructSequence_Field bpyunits_systems_fields[ARRAY_SIZE(bpyunits_usystem_items)];
 static PyStructSequence_Field bpyunits_categories_fields[ARRAY_SIZE(bpyunits_ucategorie_items)];

source/blender/python/mathutils/mathutils.c

@@ -78,7 +78,7 @@ static int mathutils_array_parse_fast(float *array,
 }
 
 /**
- * helper function that returns a Python ``__hash__``.
+ * helper function that returns a Python `__hash__`.
  *
  * \note consistent with the equivalent tuple of floats (CPython's 'tuplehash')
  */

source/blender/python/mathutils/mathutils_Matrix.c

@@ -1174,7 +1174,7 @@ static void matrix_invert_with_det_n_internal(float *mat_dst,
 }
 
 /**
- * \param r_mat: can be from ``self->matrix`` or not.
+ * \param r_mat: can be from `self->matrix` or not.
  */
 static bool matrix_invert_internal(const MatrixObject *self, float *r_mat)
 {
@@ -1191,8 +1191,8 @@ static bool matrix_invert_internal(const MatrixObject *self, float *r_mat)
 }
 
 /**
- * Similar to ``matrix_invert_internal`` but should never error.
- * \param r_mat: can be from ``self->matrix`` or not.
+ * Similar to `matrix_invert_internal` but should never error.
+ * \param r_mat: can be from `self->matrix` or not.
  */
 static void matrix_invert_safe_internal(const MatrixObject *self, float *r_mat)
 {