The following special pages appear to be missing help links. This is not an exhaustive list. The suggested target for each is also given. I'll leave this for a few days for any feedback about the targets before uploading patches.
- Extension:AbuseFilter (2):
Special:AbuseLog, Special:AbuseFilter -> Extension:AbuseFilter (on mediawiki)
No dedicated "help" page currently exists; once such a page is created the link can be changed to point there instead
- Extension:Disambiguator (2):
Special:DisambiguationPages, Special:DisambiguationPageLinks -> Extension:Disambiguator (on mediawiki)
No dedicated "help" page currently exists; once such a page is created the link can be changed to point there instead
- Extension:FlaggedRevs (6):
Special:AdvancedReviewLog, Special:PendingChanges, Special:ValidationStatistics, Special:StablePages, Special:ProblemChanges -> Help:Extension:FlaggedRevs (on mediawiki)
- Extension:Graph (1):
Special:GraphSandbox -> Extension:Graph/Guide (on mediawiki)
- Extension:MassMessage (1):
Special:CreateMassMessageList -> Help:Extension:MassMessage (on mediawiki)
- Extension:ORES (1):
Special:ORESModels -> ORES (on mediawiki)
- Extension:TemplateSandbox (1):
Special:TemplateSandbox -> Help:Extension:TemplateSandbox (on mediawiki)
- Extension:TimedMediaHandler (1):
Special:OrphanedTimedText -> https://commons.wikimedia.org/wiki/Commons:Timed_Text
No dedicated "help" page currently exists on mediawiki; rather, the extension page there links to commons for the feature overview, which is likely to be of more help than the technical documentation on mediawiki
- Extension:WikiHiero (1):
Special:Hieroglyphs -> Extension:WikiHiero/Syntax (on mediawiki)