doc: fix some nits in hardcoded manpage links
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
documentation is changed or added -
commit message follows commit guidelines
After https://github.com/nodejs/node/pull/20785, we wrap autogenerated manpage links in code elements. This PR unify some hardcoded manpage links with autogenerated ones: it adds backticks, parentheses, section numbers, and updates URLs.
Also, some typos are fixes in passing (missing periods, reference sorting).