tidy-up: miscellaneous (cont.)

- examples: replace magic numbers with `sizeof()`.
- typos: drop rules no longer needed after excluding tests/data.
- typos: move an exception inline.
- alpha-sort lists.
- fix indentation, whitespace.

Closes #18898

.github/workflows/label.yml

@@ -10,6 +10,7 @@
 # https://github.com/actions/labeler
 
 name: 'Labeler'
+
 'on': [pull_request_target]  # zizmor: ignore[dangerous-triggers]
 
 permissions: {}