Minor tweak to callback function name for clarity (in code and documentation)

examples/cpp/earthtest.cpp

@@ -104,7 +104,7 @@ struct Node
 to ensure timely receipt of future events. You should not call libzt API functions from
 this function unless it's something trivial like zts_inet_ntop() or similar that has
 no state-change implications. */
-void myZeroTierEventCallback(void *msgPtr)
+void on_zts_event(void *msgPtr)
 {
 	struct zts_callback_msg *msg = (struct zts_callback_msg *)msgPtr;
 
@@ -189,7 +189,7 @@ int main(int argc, char **argv)
 	// If disabled: Settings will NOT be read from local.conf
 	zts_allow_local_conf(1);
 
-	if((err = zts_start(argv[1], &myZeroTierEventCallback, ztServicePort)) != ZTS_ERR_OK) {
+	if((err = zts_start(argv[1], &on_zts_event, ztServicePort)) != ZTS_ERR_OK) {
 		printf("Unable to start service, error = %d. Exiting.\n", err);
 		exit(1);
 	}