Update mg_set_timer.md

docs/c-api/net.h/mg_set_timer.md

@@ -6,12 +6,12 @@ signature: |
   double mg_set_timer(struct mg_connection *c, double timestamp);
 ---
 
-Schedule MG_EV_TIMER event to be delivered at `timestamp` time.
-`timestamp` is a UNIX time (a number of seconds since Epoch). It is
+Schedules an MG_EV_TIMER event to be delivered at `timestamp` time.
+`timestamp` is UNIX time (the number of seconds since Epoch). It is
 `double` instead of `time_t` to allow for sub-second precision.
-Return the old timer value.
+Returns the old timer value.
 
-Example: set connect timeout to 1.5 seconds:
+Example: set the connect timeout to 1.5 seconds:
 
 ```
  c = mg_connect(&mgr, "cesanta.com", ev_handler);