doc: fix link for https api change

The PR number included for this api addition was originally incorrect.

PR-URL: https://github.com/nodejs/node/pull/17630
Refs: https://github.com/nodejs/node/pull/14903


Reviewed-By: Vse Mozhet Byt <vsemozhetbyt@gmail.com>
Reviewed-By: Evan Lucas <evanlucas@me.com>
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Jon Moss <me@jonathanmoss.me>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>
Reviewed-By: Rich Trott <rtrott@gmail.com>