In Refs, http.Server's maxHeadersCount field was defined in the
constructor to make hidden class stable and so on. Also in https.Server,
we can use maxHeadersCount the same as http via connectionListener. So,
defines it in the constructor and documentation.
Refs: https://github.com/nodejs/node/pull/9116
PR-URL: https://github.com/nodejs/node/pull/20359
Reviewed-By: Matteo Collina <matteo.collina@gmail.com>
Reviewed-By: Trivikram Kamat <trivikr.dev@gmail.com>
