There's a merged pull request on the void-packages repository

CONTRIBUTING.md: add info about updating templates, misc other changes
https://github.com/void-linux/void-packages/pull/38491

Description:
- a few small formatting/grammar changes/corrections
- document cloning with https, github-cli
- document using non-fork-master branch for changes
- document not using web ui for commiting
- add example commits for non-package changes
- add xrevbump
- reorder so testing build locally is before committing (more chronological)
- update xtools URL