Merge branch 'pb/template-for-single-commit-pr' into maint-2.43

Doc update.

* pb/template-for-single-commit-pr:
  .github/PULL_REQUEST_TEMPLATE.md: add a note about single-commit PRs

Author: gitster

.github/PULL_REQUEST_TEMPLATE.md

@@ -4,4 +4,7 @@ a mailing list ([email protected]) for code submissions, code reviews, and
 bug reports. Nevertheless, you can use GitGitGadget (https://gitgitgadget.github.io/)
 to conveniently send your Pull Requests commits to our mailing list.
 
+For a single-commit pull request, please *leave the pull request description
+empty*: your commit message itself should describe your changes.
+
 Please read the "guidelines for contributing" linked above!