Dependabot private Ruby registry config: Fix indentation of replaces-base

[patbl]

Why:

It's silly to have things indented wrongly (not sure whether it breaks anything though).

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

This fixes the indentation of YAML in an example.

https://docs-26538-926381.preview.ghdocs.com/en/code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file#rubygems-server

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The table contains an overview of files in the content directory that have been changed in this pull request. It's provided to make it easy to review your changes on the staging site. Please note that changes to the data directory will not show up in this table.

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Content directory changes

You may find it useful to copy this table into the pull request summary. There you can edit it to share links to important articles or changes and to give a high-level overview of how the changes in your pull request support the overall goals of the pull request.

Source	Preview	Production	What Changed
code-security/dependabot/dependabot-version-updates/configuration-options-for-the-dependabot.yml-file.md	fpt ghec ghes@ 3.9 3.8 3.7 3.6	fpt ghec ghes@ 3.9 3.8 3.7 3.6

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fpt: Free, Pro, Team
ghec: GitHub Enterprise Cloud
ghes: GitHub Enterprise Server
ghae: GitHub AE

[cmwilson21]

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

[subatoi]

Thank you for spotting and fixing this, and for your interest in helping us to improve our Docs! ✨

[github-actions]

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