changed option name. +documentation changes

doc/zmq_setsockopt.txt

@@ -421,19 +421,21 @@ Default value:: 0
 Applicable socket types:: ZMQ_ROUTER
 
 
-ZMQ_PROBE_NEW_PEERS: automatically send empty packet to every established connection
+ZMQ_PROBE: automatically send empty packet to every established connection
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 
-Sets the 'ROUTER' & 'DEALER' sockets behavior to automatically send an empty packet
+Sets the compatible sockets behavior to automatically send an empty packet
 to any new connection made (or accepted) by socket. It could help sockets to
-auto discovery themself. It especially important in 'ROUTER' <-> 'ROUTER' connections
+auto discovery them-self. It especially important in 'ROUTER' <-> 'ROUTER' connections
 where it solves 'who will write first' problems.
+NOTE: Don't set this options for sockets working with ZMQ_REP, ZMQ_REQ sockets.
+It will interfere with their strict synchronous logic and framing.
 
 [horizontal]
 Option value type:: int
 Option value unit:: 0, 1
 Default value:: 0
-Applicable socket types:: ZMQ_ROUTER, ZMQ_DEALER
+Applicable socket types:: ZMQ_ROUTER, ZMQ_DEALER, ZMQ_REP, ZMQ_REQ
 
 
 ZMQ_XPUB_VERBOSE: provide all subscription messages on XPUB sockets