Update https.md

Author: jtgasper3

engine/security/https.md

@@ -118,7 +118,7 @@ config file:
 
     $ echo extendedKeyUsage = clientAuth >> extfile.cnf
 
-Now sign the private key:
+Now, generate the signed certificate:
 
     $ openssl x509 -req -days 365 -sha256 -in client.csr -CA ca.pem -CAkey ca-key.pem \
       -CAcreateserial -out cert.pem -extfile extfile.cnf