The following special pages are missing help links. Each should have a "help" link added, with a suggested target listed
[x] Special:ApiFeatureUsage -> Extension:ApiFeatureUsage (https://www.mediawiki.org/wiki/Extension:ApiFeatureUsage)
[] Special:Book -> help page on enwiki (https://en.wikipedia.org/wiki/Help:Books) - the extension's page on mediawiki is outdated, and not as helpful for users as the enwiki version
[x] Special:CiteThisPage -> Extension:CiteThisPage (https://www.mediawiki.org/wiki/Extension:CiteThisPage)
[x] Special:GlobalBlock, Special:GlobalBlockList, Special:GlobalBlockWhitelist, Special:GlobalUnblock -> Extension:GlobalBlocking (https://www.mediawiki.org/wiki/Extension:GlobalBlocking)
[x] Special:GlobalUsers, Special:GlobalGroupPermissions, Special:CentralAuth, Special:GlobalRenameProgress, Special:MergeAccount -> Extension:CentralAuth (https://www.mediawiki.org/wiki/Extension:CentralAuth)