Fix typoes on ActionDispatch::HTTP::FilterParameters

[aeroastro]

Summary

I have fixed 2 typoes on the comment of ActionDispatch::HTTP::FilterParameters

• Add a continuative relative pronoun and an additional definite article for more understandable document.
• Use present tense on method description.

[rails-bot]

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[aeroastro]

Thank you for merging this.
🐱