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

source/blender/python/bmesh/bmesh_py_ops_call.h

@@ -28,4 +28,7 @@ typedef struct {
   const char *opname;
 } BPy_BMeshOpFunc;
 
+/**
+ * This is the `__call__` for `bmesh.ops.xxx()`.
+ */
 PyObject *BPy_BMO_call(BPy_BMeshOpFunc *self, PyObject *args, PyObject *kw);