doc: fix quotes in tls.md

Added the missing single quotes in minVersion and maxVersion of api/tls
doc before TLSv1.2.

PR-URL: https://github.com/nodejs/node/pull/33641


Reviewed-By: Ruben Bridgewater <ruben@bridgewater.de>
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Juan José Arboleda <soyjuanarbol@gmail.com>
Reviewed-By: Richard Lau <riclau@uk.ibm.com>