Document branch switcher feature in pipeline editor (!61771) · Merge requests · GitLab.org / GitLab · GitLab

What does this MR do?

Documentation for the rollout of the branch switcher feature flag

Does this MR meet the acceptance criteria?

Conformity

I have added/updated documentation. (Is documentation required?)
This MR does not harm performance, or I have asked a reviewer to help assess the performance impact. (Merge request performance guidelines)