docs: added list of valid namespace codes for the cacheTtlOverride config

[justo-mend]

Changes

Added list of valid namespace codes for the cacheTtlOverride configuration

Context

To make it easier for users of the cacheTtlOverride option, the known list of namespace key codes has been added to the config page.

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please select one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[github-actions]

Hi, please format any copy/pasted code or logs so they're readable.

You can find a Markdown code formatting guide here as well as some GitHub-specific information formatting code blocks here.

Thanks, the Renovate team

[rarkins]

@justo-mend please see above for what is meant by "backticks". You can choose between single or triple backticks

[justo-mend]

Code values formatted with single back-ticks.

[renovate-release]

🎉 This PR is included in version 39.122.1 🎉

The release is available on:

• GitHub release
• npm package (@latest dist-tag)
• 39.122.1

Your semantic-release bot 📦🚀