Default num_acceptors.ssl is 10

It used to be limited to 1 because of an ssl
application bug in OTP that resulted in excessive
log noise per acceptor. That's no longer true
and the limit has been bumped to 10 months ago.

Author: michaelklishin

docs/rabbitmq.conf.example

@@ -38,7 +38,7 @@
 ## and TLS listeners.
 ##
 # num_acceptors.tcp = 10
-# num_acceptors.ssl = 1
+# num_acceptors.ssl = 10
 
 
 ## Maximum time for AMQP 0-8/0-9/0-9-1 handshake (after socket connection