Follow-up from "Moved yaml-specific features to new page"

The following discussion from !72646 (merged) should be addressed:

• @sselhorn started a discussion:

  This topic doesn't belong on this page either, but I wasn't sure where to put it. If you have an idea I can do it in a follow-up MR. Thanks!

The section says:

## Processing Git pushes

GitLab creates at most four branch and tag pipelines when
pushing multiple changes in a single `git push` invocation.

This limitation does not affect any of the updated merge request pipelines.
All updated merge requests have a pipeline created when using
[pipelines for merge requests](../pipelines/merge_request_pipelines.md).

It definitely does not belong in the yaml reference, but I'm not sure where it should go...