bug#41109: Say where the gnus-bugs website is

[Lars Ingebrigtsen]

積丹尼 Dan Jacobson <jidanni@jidanni.org> writes:

> (info "(gnus) Compatibility") mentions gnus-bug, but doesn't say where
> to first look to see if others have already submitted the bug, or to see
> if one's bug really has gotten posted.
> Nor does the gnus-bug docstring say.

I don't think it makes sense for either that manual node to say, but I
guess the doc string could.  Especially since it seems like an oddly
difficult thing to google for.

I've also added it to the report-emacs-bug doc string.

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