I've just posted a request at Help talk:CirrusSearch asking that the help link on this wiki's search results page point to Help:CirrusSearch, instead of the default Help:searching. I interpret help talk:searching discussions as saying that Help:Searching describes MWSearch, which is Search for installations whose Special:versions don't include any search extensions.
Although I think recent edits at help:searching should be reverted, Elvey, Searching, help, pages (on WP, MW, Wikidata) are in great need. They're like a ghost town, so I'm glad to see your efforts. Cpiral (talk) 02:42, 29 June 2016 (UTC)