Merge pull request #3862 from gummif/gfa/poller-formatting

Problem: Strange zmq_poller doc formatting

doc/zmq_poller.txt

@@ -11,19 +11,25 @@ SYNOPSIS
 --------
 
 *void *zmq_poller_new (void);*
-*int zmq_poller_destroy (void **'poller_p');*
 
-*int zmq_poller_add (void *'poller', void *'socket', void *'user_data', short 'events');
+*int zmq_poller_destroy (void ****'poller_p');*
+
+*int zmq_poller_add (void *'poller', void *'socket', void *'user_data', short 'events');*
+
 *int zmq_poller_modify (void *'poller', void *'socket', short 'events');*
+
 *int zmq_poller_remove (void *'poller', void *'socket');*
 
 *int zmq_poller_add_fd (void *'poller', int 'fd', void *'user_data', short 'events');*
+
 *int zmq_poller_modify_fd (void *'poller', int 'fd', short 'events');*
+
 *int zmq_poller_remove_fd (void *'poller', int 'fd');*
 
 *int zmq_poller_wait (void *'poller',
                           zmq_poller_event_t *'event',
                           long 'timeout');*
+
 *int zmq_poller_wait_all (void *'poller',
                           zmq_poller_event_t *'events',
                           int 'n_events',