`doc only` change XXXXX to proper words

docs/dev/contributing.md

@@ -76,7 +76,7 @@ When submitting a PR:
 - Base your branch off the current `main`.
 - Add both your code and new tests if relevant.
 - Please do not include merge commits in pull requests; include only commits with the new relevant code.
-- When submitting a PR for a bug, label the PR "Bug XXXXX"
+- When submitting a PR for a bug, label the PR "Bug <Insert bug number here>"
 - When committing a PR and when it makes sense to skip the CI, add in a `doc only` annotation to the commit message
 
 ## Code Review