Docs: show alert for features behind flags
Problem to solve
- From: https://gitlab.slack.com/archives/CDWGE0DDY/p1593471666293200
- And: https://gitlab.slack.com/archives/CDWGE0DDY/p1594385249369100
Folks see features on the docs, try to use them, don't find them, and get confused. That's bc the feature is behind a flag, disabled.
To clarify that the feature may/may not be available, add an alert box saying the state of the FF just below the feature heading.
Further details
Proposal
Who can address the issue
@marcia // Style committe