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Add missing type hinting to Help module docblocks

Project:Drupal core
Version:8.x-dev
Component:documentation
Category:task
Priority:normal
Assigned:Unassigned
Status:active

Issue Summary

This is a sub-issue of #1800046: [META] Add missing type hinting to core docblocks focused on correctly adding @param and @return type hinting to the Help module.

Documentation patches that include type hinting are time consuming to both review and commit because one must dig into the actual code to confirm that the type hints are both correct and complete. Hence, please be patient and try to limit type hint patches to covering only a limited number of docblocks (10-15 as a guess).

Related sprint issues:

Sprint Topic Sub Issue
#1518116: [meta] Make Core pass Coder Review #1533244: Make help module pass Coder Review
#1310084: [meta] API documentation cleanup sprint #1319904: Clean up API docs for help module
#500866: [META] remove t() from assert message #1797330: Remove t() from assertion messages in tests for the help module