Make "Rolling out changes" docs more discoverable
What does this MR do and why?
This adds a "Toggle a feature flag" section to the top-level feature flags documentation page. The section just links to the "Rolling out changes" section in the feature flags controls page in an attempt to make it more discoverable.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Related to #361690 (closed)