This is the parent task for documentation updates for the new hook system based on Hook Container.

To do: Pilot

3 story points:

• Update hooks manual on mediawiki.org with intro section (T250754) (Nikki and Alex)
• Add interfaces to individual hook pages on mediawiki.org (T250757) (Alex)
• Create architecture documentation (https://gerrit.wikimedia.org/r/c/mediawiki/core/+/593982) (Tim)
• Send announcement about changes to hook behavior in Core to wikitech-l following merging of key patches (Tim)
• Troubleshoot group docs on Doxygen to create a list of available hooks (T253815) (Alex)

1-2 story points:

• Update docs section on https://www.mediawiki.org/wiki/Manual:Hooks (Alex)
• Search mediawiki.org for references to hooks.txt and update (Alex)
• Update https://www.mediawiki.org/wiki/Manual:Extension.json/Schema#Hooks (Alex)
• Add callout on hooks.txt that points to the new system and redirects updates to hook interfaces (https://gerrit.wikimedia.org/r/c/mediawiki/core/+/593982) (Tim)

To do: After migrating a few extensions and after release of 1.35

• Update https://www.mediawiki.org/wiki/Manual:Developing_extensions
• Finish updates to individual hook pages on mediawiki.org (T250757)
• Finish updating hooks manual on mediawiki.org (T250754)
• Update https://www.mediawiki.org/wiki/Extension:BoilerPlate and https://www.mediawiki.org/wiki/Extension:Example (T254381) (Nikki)
• Open a task summarizing our thoughts on creating a system that pulls documentation from hook interfaces into individual hook wiki pages (Example using extension data: https://www.mediawiki.org/wiki/Module:ExtensionJson), including auditing docs in the individual hook pages for additional content and managing translation (Alex)