Cleanup: move public doc-strings into headers for 'python'

source/blender/python/mathutils/mathutils_Vector.h

@@ -35,14 +35,26 @@ typedef struct {
 PyObject *Vector_CreatePyObject(const float *vec,
                                 const int size,
                                 PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT;
+/**
+ * Create a vector that wraps existing memory.
+ *
+ * \param vec: Use this vector in-place.
+ */
 PyObject *Vector_CreatePyObject_wrap(float *vec,
                                      const int size,
                                      PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT
     ATTR_NONNULL(1);
+/**
+ * Create a vector where the value is defined by registered callbacks,
+ * see: #Mathutils_RegisterCallback
+ */
 PyObject *Vector_CreatePyObject_cb(PyObject *user,
                                    int size,
                                    unsigned char cb_type,
                                    unsigned char subtype) ATTR_WARN_UNUSED_RESULT;
+/**
+ * \param vec: Initialized vector value to use in-place, allocated with #PyMem_Malloc
+ */
 PyObject *Vector_CreatePyObject_alloc(float *vec,
                                       const int size,
                                       PyTypeObject *base_type) ATTR_WARN_UNUSED_RESULT