Proposes and documents a location for running chatops commands related to feature flag control.
The slack rooms were suggested by @splattael and @sengelhard though we should document this with the feature flag documentation.
This MR also makes a few minor tweaks to headings and wording.
If this MR contains changes to processing or storing of credentials or tokens, authorization and authentication methods and other items described in the security review guidelines:
@gitlab-com/gl-security/appsec
Part of #32133 (closed)