Problem: typos in manpage entry for ZMQ_XPUB_MANUAL_LAST_VALUE

Solution: fix them

doc/zmq_setsockopt.txt

@@ -1074,12 +1074,12 @@ Applicable socket types:: ZMQ_XPUB
 
 
 ZMQ_XPUB_MANUAL_LAST_VALUE: change the subscription handling to manual
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 This option is similar to ZMQ_XPUB_MANUAL.
-What is the difference, ZMQ_XPUB_MANUAL_LAST_VALUE sets the 'XPUB' socket
-behaviour to send the first message to the last subscriber after the 'XPUB' socket
-recieve a subscription and call setsockopt with ZMQ_SUBSCRIBE on 'XPUB' socket.
-This prevent duplicated message when use last value caching(LVC).
+The difference is that ZMQ_XPUB_MANUAL_LAST_VALUE changes the 'XPUB' socket
+behaviour to send the first message to the last subscriber after the socket
+receives a subscription and call setsockopt with ZMQ_SUBSCRIBE on 'XPUB' socket.
+This prevents duplicated messages when using last value caching(LVC).
 
 NOTE: in DRAFT state, not yet available in stable releases.