doc: fix paragraph line-height issue
Checklist
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make -j4 test
(UNIX), orvcbuild test
(Windows) passes -
commit message follows commit guidelines
Affected core subsystem(s)
doc
Fix a line-height issue introduced in #15660 where paragraphs containing <code>
blocks would have unequal line heights.
Fixes: https://github.com/nodejs/nodejs.org/issues/1399