clang-format: update reformatting instruction comments

.clang-format

 # Note: if you change any of the settings here, please reformat the entire
-# codebase as part of the same commit, that will prevent subsequent commits
-# from being flagged as being improperly formatted.
+# codebase as part of the same merge request, that will prevent subsequent
+# commits from being flagged as being improperly formatted.
 
 ---
 # This configuration requires clang-format 16 or higher.