[doc] Announce support of MediaWiki < 1.23 is to be dropped
[doc] Announce support of MediaWiki < 1.23 is to be dropped

Bug: T268979
Change-Id: I019ff7c3d5fa3a5a1285ea19a6aaf3164e0e6cfb

wikimedia/pywikibot-core,wikimedia/pywikibot-core