Problem: markdown errors in zmq_getsockopt.txt

Solution: fix them

doc/zmq_getsockopt.txt

@@ -224,7 +224,7 @@ Applicable socket types:: all, when using TCP or IPC transports
 
 
 ZMQ_GSSAPI_SERVER: Retrieve current GSSAPI server role
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Returns the 'ZMQ_GSSAPI_SERVER' option, if any, previously set on the socket.
 
 [horizontal]
@@ -744,7 +744,7 @@ Applicable socket types:: all, when using TCP transports.
 
 
 ZMQ_TCP_KEEPALIVE_IDLE: Override TCP_KEEPIDLE (or TCP_KEEPALIVE on some OS)
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Override 'TCP_KEEPIDLE'(or 'TCP_KEEPALIVE' on some OS) socket option (where
 supported by OS). The default value of `-1` means to skip any overrides and
 leave it to OS default.
@@ -923,7 +923,7 @@ Applicable socket types:: ZMQ_ROUTER
 
 
 ZMQ_IN_BATCH_SIZE: Maximal receive batch size
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Gets the maximal amount of messages that can be received in a single
 'recv' system call.
 
@@ -939,7 +939,7 @@ Applicable socket types:: All, when using TCP, IPC, PGM or NORM transport.
 
 
 ZMQ_OUT_BATCH_SIZE: Maximal send batch size
-~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 Gets the maximal amount of messages that can be sent in a single
 'send' system call.