proposal: add custom commit message example (s)

[fuadop]

Why:

This is related to dependabot/dependabot-core#5192 .

cc: @jeffwidman

Closes [https://github.com/dependabot/dependabot-core/issues/5192 ]

What's being changed:

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Source	Preview	Production	What Changed
code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file.md	fpt ghec ghes@ 3.5 3.4 3.3	fpt ghec ghes@ 3.5 3.4 3.3

[jeffwidman]

Thanks for putting up the PR! We always appreciate improvements to the docs.

[cmwilson21]

@fuadop Thanks so much for opening a PR! I'll get this triaged for review ⚡

[mchammer01]

@fuadop 👋🏻 - LGTM ✨
I've made a few minor comments, mainly to do with formatting and content models in our docs. Will apply the suggestions and then hopefully merge this PR.
Thank you for contributing to improve out docs ⚡

[github-actions]

Thanks very much for contributing! Your pull request has been merged 🎉 You should see your changes appear on the site in approximately 24 hours. If you're looking for your next contribution, check out our help wanted issues ⚡

[fuadop]

Thanks @mchammer01 @cmwilson21 @jeffwidman for your help on this 🎉❤️.

[tobiasdiez]

I'm confused by this remark in the docs and went to the code to understand the behavior. The commit message prefix is determined in (if I'm not mistaken):
https://github.com/dependabot/dependabot-core/blob/c00613fdce7f13eb832d5cd5ae9f0ac116edb50c/common/lib/dependabot/pull_request_creator/pr_name_prefixer.rb#L74-L82

If I'm reading this correctly, then with

commit-message:
      prefix: "pip prod"
      prefix-development: "pip dev"
      include: "scope"

the prefix would be:

• for production deps: pip prod(deps)
• for dev deps: pip dev(deps-dev)

Can someone please clarify this. Thanks!