Update mg_broadcast.md

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

@@ -6,14 +6,14 @@ signature: |
   void mg_broadcast(struct mg_mgr *, mg_event_handler_t func, void *, size_t);
 ---
 
-Pass a message of a given length to all connections.
+Passes a message of a given length to all connections.
 
 Must be called from a thread that does NOT call `mg_mgr_poll()`.
 Note that `mg_broadcast()` is the only function
 that can be, and must be, called from a different (non-IO) thread.
 
 `func` callback function will be called by the IO thread for each
-connection. When called, event would be `MG_EV_POLL`, and message will
-be passed as `ev_data` pointer. Maximum message size is capped
+connection. When called, the event will be `MG_EV_POLL`, and a message will
+be passed as the `ev_data` pointer. Maximum message size is capped
 by `MG_CTL_MSG_MESSAGE_SIZE` which is set to 8192 bytes.