docs: fixed typos/grammatical mistakes in metrics.md (backport release-3.3.x) #15241
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Backport 658fb24 from #15166
What this PR does / why we need it:
Fixes a few typos & grammatical mistakes in
metrics.md
Which issue(s) this PR fixes:
N/A
Special notes for your reviewer:
N/A
Checklist
CONTRIBUTING.md
guide (required)feat
PRs are unlikely to be accepted unless a case can be made for the feature actually being a bug fix to existing behavior.docs/sources/setup/upgrade/_index.md
deprecated-config.yaml
anddeleted-config.yaml
files respectively in thetools/deprecated-config-checker
directory. Example PR