correct doc for (audio|video)_tag [ci skip]
Escape user input before showing in the page.

This is not a security issue since this page is not present in
production and user have to type something in the field but is better to
escape the input.
Skip individual tests upon Dalli::RingError

Unlike the outer `rescue`, this one is much more precise about what we
want to handle: a connection failure (`Dalli::RingError`) is not
relevant to what we're testing here. But other Dalli errors may well be
indicating an actual problem.
Merge pull request #15342 from aditya-kapoor/correct-tag-docs

correct docs for audio_tag and video_tag [ci skip]
Merge pull request #15345 from matthewd/skip-dalli-errors

Skip individual tests upon Dalli::RingError