Cleanup: comments (mainly long lines)

Comments after code can cause awkward line breaks.

source/blender/python/intern/bpy_rna_id_collection.c

@@ -54,20 +54,21 @@
 #include "bpy_rna.h"
 
 typedef struct IDUserMapData {
-  /* place-holder key only used for lookups to avoid creating new data only for lookups
+  /** Place-holder key only used for lookups to avoid creating new data only for lookups
    * (never return its contents) */
   PyObject *py_id_key_lookup_only;
 
-  /* we loop over data-blocks that this ID points to (do build a reverse lookup table) */
+  /** We loop over data-blocks that this ID points to (do build a reverse lookup table) */
   PyObject *py_id_curr;
   ID *id_curr;
 
-  /* filter the values we add into the set */
+  /** Filter the values we add into the set. */
   BLI_bitmap *types_bitmap;
 
-  PyObject *user_map; /* set to fill in as we iterate */
-  bool
-      is_subset; /* true when we're only mapping a subset of all the ID's (subset arg is passed) */
+  /** Set to fill in as we iterate. */
+  PyObject *user_map;
+  /** true when we're only mapping a subset of all the ID's (subset arg is passed). */
+  bool is_subset;
 } IDUserMapData;
 
 static int id_code_as_index(const short idcode)