fix: typos, grammar and clarity A380X Pilot's Corner

[Luz5020]

Summary

This PR fixes multiple typos and grammatical mistakes that could impact readability. It also conatins minor changes that make the documentation more clear in certain parts.

Location

https://docs.flybywiresim.com/pilots-corner/

Discord username (if different from GitHub):

[github-actions[bot]]

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[frankkopp]

Thanks for fixing these.