Document the personal setting for displaying or hiding the unread
message summary counters in the left sidebar shown next to the
home view and channels header.
Fixes#35076.
Co-authored-by: Alya Abbott <alya@zulip.com>
This is a followup commit to #30824.
Fixes
https://chat.zulip.org/#narrow/stream/9-issues/topic/.F0.9F.8E.AF.20help.20not.20updated.20for.20new.20preferences.20sections/near/1899330.
git grep in the help directory will still show up results for `Advanced`
but those are mostly used in either plain english language instructions
or refer to some other part of the app. At the point of writing this
commit, there were 6 results for `Advanced`, 4 of which were plain
english, 1 refers to the Advanced settings in chrome for desktop
notifications, and another one refers to `Advanced configurations` for
channel settings.
