Update getHelpUrls() for reworked mw.org API pages

Update getHelpUrls() for reworked mw.org API pages

Community members restructured the mediawiki.org API pages, e.g.
the meta allmessages query submodule is no longer in the catch-all
https://www.mediawiki.org/wiki/API:Meta?oldid=1408361#allmessages_.2F_am
but its own https://www.mediawiki.org/wiki/API:Allmessages

The links in the generated API help, e.g.
https://www.mediawiki.org/wiki/Special:ApiHelp/query+allmessages,  are no
correct. They're not 404s but they don't take you directly to the
relevant page.

This patch set fixes the getHelpUrls() URLs (and does nothing else).
I tested them all.

Thanks RobinHood70!

Change-Id: Icea94abdd22d1ad468172642a21641e7c5ce2046