doc: fix API descriptions for OpenSSL-1.1.0

Fixes: https://github.com/nodejs/node/issues/4270
PR-URL: https://github.com/nodejs/node/pull/19794


Reviewed-By: James M Snell <jasnell@gmail.com>
Reviewed-By: Rod Vagg <rod@vagg.org>
Reviewed-By: Michael Dawson <michael_dawson@ca.ibm.com>