[v6.x backport] doc: fix various nits #19761
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Checklist
make -j4 test(UNIX), orvcbuild test(Windows) passesBackport of #19743 (proactive)
Commit 1: replace 2 hyphens (
--) by spaced m-dash (—) as perSTYLE_GUIDE.md.Commit 2: space infix operators.
Commit 3: unify quotes in inline code spans (use only single quotes).
Commit 4: unify
* Returns:(eliminate deviations).Commit 5: dedupe spaces.