Fix docs for allowed params to `get` in controller tests  [ci skip]
Fix docs for allowed params to `get` in controller tests  [ci skip]

Fixes #26602

Relevant method documentation:

https://github.com/rails/rails/blob/abe3da9f12710ea85be69b17172bef41220037fc/actionpack/lib/action_dispatch/testing/integration.rb#L14-L43

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