Dylan Griffith authored Sep 21, 2023 and Marius Bobin committed Sep 21, 2023

The previous documentation said "a cron worker must be defined as well"
which did not seem to be correct as some of these workers aren't queued
this way. Additionally the previous example didn't make sense because
cron workers don't get passed arguments.

I've also opted to remove the duplicated docs example from the class for
a single source of truth. I also like the docs in the Ruby code to make
it clearer to the reader but the risk of getting out of sync with the
primary documentation (and the fact that it was currently confusing)
seemed like it wasn't worth keeping.

After some discussion in
https://gitlab.com/gitlab-org/gitlab/-/merge_requests/131856#note_1560807567
I also clarified that this worker doesn't really keep the arguments sent
to it in a queue like a normal worker so I wanted to make that more
explicit that it can't just be used to throttle a normal worker.