Cleanup: spelling in comments (make check_spelling*)

- Back-tick quote math expressions so differentiate them
  from English.
- Use doxygen code blocks for TEX expressions.

source/blender/python/intern/bpy_rna_array.cc

@@ -989,7 +989,7 @@ PyObject *pyrna_py_from_array(PointerRNA *ptr, PropertyRNA *prop)
 
   ret = pyrna_math_object_from_array(ptr, prop);
 
-  /* is this a maths object? */
+  /* Is this a math object? */
   if (ret) {
     return ret;
   }