docs: fix three typos in benchmark and auth docs #8663
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This PR corrects three minor typos in documentation. It is strictly a grammar/wording cleanup with no behavioral or API changes. The changes are split into three commits (one per typo) for easier review.
What changed
Documentation/benchmark.md: “a histograms” → “a histogram”Documentation/benchmark.md: “The options takes …” → “The options take …”Documentation/grpc-auth-support.md: “… simply lookup the authorization key.” → “… simply look up the authorization key.”Rationale
Improve clarity and correctness of docs; typo-only edits with no content changes.
Testing
N/A – documentation-only changes.
Dependencies
No new dependencies and no code changes.
RELEASE NOTES: n/a