cleanup: fix typos in comments and docs

Followup to https://developer.blender.org/D10288

Reviewed By: Blendify

Differential Revision: https://developer.blender.org/D10346

release/scripts/modules/bl_i18n_utils/utils.py

@@ -778,7 +778,7 @@ class I18nMessages:
         try:
             import bpy
         except ModuleNotFoundError:
-            print("Could not import bpy, find_best_messages_matches must be run from whithin Blender.")
+            print("Could not import bpy, find_best_messages_matches must be run from within Blender.")
             return
 
         # Build helper mappings.