[docs] Improve description accuracy of pfx option (#597)
[docs] Improve description accuracy of pfx option (#597)

Reference: https://nodejs.org/docs/latest-v6.x/api/tls.html#tls_tls_createsecurecontext_options
socketio/engine.io-client,Automattic/engine.io-client,socketio/engine.io-client,socketio/engine.io-client