doc: enforce max-line-length lint rule
Includes 80 character limit for docs linter.
I managed to add the linter rule for the docs, but I'm not sure of an elegant way to fix existing lines than exceed 80 characters.
Fixes: https://github.com/nodejs/node/issues/18703
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
tests and/or benchmarks are included -
documentation is changed or added -
commit message follows commit guidelines