Updates limit Option for favourites

[jswright61]

When exploring the API on ruby.social, I came across an inconsistency between the default parameter documented and the actual API call with that parameter omitted. I have updated the documentation to reflect what is actually occurring.

Note: one change highlighted below is a deletion of a trailing whitespace character. Since it seemed that the standard was to not have trailing whitespace at the ends of lines, I left that change in place.

Previously defaulted to 40, now defaults to 20.
Previously no max value stated, now states max value is 40.

[jswright61]

I suspect that this is a common issue on many endpoints, I did not make further changes because I wanted to make sure the core team wanted this and similar changes before doing the work to explore where the limit parameter differs from the documentation and making those changes where appropriate.

[jswright61]

I did look for community guidelines and steps for submitting PRs (I didn't look hard, but I did look) and didn't find them. I decided to submit this tiny PR.
I can close it and resubmit a new one according to guidelines if someone would kindly point them out.

[trwnh]

I believe this is just a one-off mistake. The default statuses limit is 20. The default accounts limit is 40. Some other controllers have one-off limits. The maximum is twice the default limit.

Likely what happened was that the language for the limit parameter was copied around a lot and in this case it was copied from an accounts method to a statuses method.

In any case, I'll go back and verify all uses of the limit parameter based on whether they target accounts or statuses.

[trwnh]

Added to #1060