Document behavior of prefix in dependabot.yml

[schra]

Why:

It would have been helpful to me if the documentation was more straight-forward about that a : is appended to the commit title by default and how to disable that the : is appended (for example, by having trailing whitespace)

For reference, here is the implementation:
https://github.com/dependabot/dependabot-core/blob/06702c83e5d964173504ddba6838c37fe37207ba/common/lib/dependabot/pull_request_creator/pr_name_prefixer.rb#L75-L83

What's being changed (if available, include any code snippets, screenshots, or gifs):

Add an example, how to disable that a : is appended.

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• For content changes, I have completed the self-review checklist.

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[github-actions]

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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@ 3.7 3.6 3.5 3.4 3.3	fpt ghec ghes@ 3.7 3.6 3.5 3.4 3.3

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ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

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

[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[mchammer01]

Hi @schra - thanks for raising this issue ✨
I am going to liaise with the Dependabot Updates team and will come back to you once I've heard from them. Thanks for your patience 💖

[mchammer01]

@schra - thanks for creating this PR to document the behavior of prefix ✨
I haven't been able to commit a change I'd like to make to line 251. As well as providing users with the example you've updated, I'd like us to explicitly document the behavior. Can you add the following to that line, after prefix specifies a prefix for all commit messages.?

When you specify a prefix for commit messages, {% data variables.product.prodname_dotcom %} will automatically add a colon between the defined prefix and the commit message, unless you end the end the prefix with a space. The code snippet below provides examples of both in the same configuration file.

Thank you 😃
Feel free to ping me when you're done. I'll review again and will ask an engineer from the Dependabot Updates team to give this a quick technical review, before we merge this 🙇🏻

[mchammer01]

@schra - This LGTM
Thanks for your patience, and for working with me on this contribution ✨

[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 ⚡

[schra]

Awesome, thanks for merging and your input @mchammer01 :)