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docs: fix doc comments for Router
Description
- small fix
Checklist:
- [x] Securely signed commits
- [x] Component(s) with PHPDoc blocks, only if necessary or adds value
- [] Unit testing, with >80% coverage
- [] User guide updated
- [x] Conforms to style guide
It returns "Controller classname or Closure", but I don't know why this method needs to return.
Because we have controllerName() for that purpose.