Despite @matmarex saying this, I can’t get it working in Russian Wikipedia with Module namespace:
- https://ru.wikipedia.org/wiki/MediaWiki:Namespace-828-helppage
- https://ru.wikipedia.org/wiki/Модуль:GamesSport
In Category namespace it works fine:
- https://ru.wikipedia.org/wiki/MediaWiki:Namespace-14-helppage
- https://ru.wikipedia.org/wiki/Категория:Кошки has the set link
It should be possible to set custom help links for namespaces based on that syntax, like was suggested in T45591: Link translatable help pages on mediawiki.org from the relevant special pages, actions etc.
* (T45591) Links to MediaWiki.org translatable help were added to indicators, mostly in special pages. Local custom target titles can be placed in the relevant '(namespace-X|action name|special page name)-helppage' system message. Extensions can use the addHelpLink() function to do the same.