Add names to mg_event_handler_t's args

PUBLISHED_FROM=3caea25dec11260561349fa096547bd62ecdb509

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

@@ -3,7 +3,7 @@ title: "mg_event_handler_t"
 decl_name: "mg_event_handler_t"
 symbol_kind: "typedef"
 signature: |
-  typedef void (*mg_event_handler_t)(struct mg_connection *, int ev, void *);
+  typedef void (*mg_event_handler_t)(struct mg_connection *nc, int ev, void *ev_data);
 ---
 
 Callback function (event handler) prototype. Must be defined by the user.

mongoose.h

@@ -2749,7 +2749,7 @@ struct mg_connection;
  * Callback function (event handler) prototype. Must be defined by the user.
  * Mongoose calls the event handler, passing the events defined below.
  */
-typedef void (*mg_event_handler_t)(struct mg_connection *, int ev, void *);
+typedef void (*mg_event_handler_t)(struct mg_connection *nc, int ev, void *ev_data);
 
 /* Events. Meaning of event parameter (evp) is given in the comment. */
 #define MG_EV_POLL 0    /* Sent to each connection on each mg_mgr_poll() call */