Merge pull request #2023 from jimenezrick/patch-1

Problem: update zmq_setsockopt doc with new flag name

doc/zmq_setsockopt.txt

@@ -14,7 +14,7 @@ SYNOPSIS
 
 Caution: All options, with the exception of ZMQ_SUBSCRIBE, ZMQ_UNSUBSCRIBE,
 ZMQ_LINGER, ZMQ_ROUTER_HANDOVER, ZMQ_ROUTER_MANDATORY, ZMQ_PROBE_ROUTER,
-ZMQ_XPUB_VERBOSE, ZMQ_XPUB_VERBOSE_UNSUBSCRIBE, ZMQ_REQ_CORRELATE,
+ZMQ_XPUB_VERBOSE, ZMQ_XPUB_VERBOSER, ZMQ_REQ_CORRELATE,
 ZMQ_REQ_RELAXED, ZMQ_SNDHWM and ZMQ_RCVHWM, only take effect for
 subsequent socket bind/connects.