doc: fix misc. mislabeled code block info strings

Prior to this commit, a handful of misc. code blocks were in need
of fixup. Corrections are according to predetermined conventions.

Closes: https://github.com/nodejs/node/issues/32938

PR-URL: https://github.com/nodejs/node/pull/33548
Fixes: https://github.com/nodejs/node/issues/32938


Reviewed-By: Rich Trott <rtrott@gmail.com>