Update NativeModulesIOS.md

Author: meetwudi

docs/NativeModulesIOS.md

@@ -178,13 +178,20 @@ The native module can signal events to JavaScript without being invoked directly
 
 ```objective-c
 #import "RCTBridge.h" 
+#import "RCTEventDispatcher.h"
+
+@implementation CalendarManager
+
+@synthesize bridge = _bridge; 
 
 - (void)calendarEventReminderReceived:(NSNotification *)notification
 {
   NSString *eventName = notification.userInfo[@"name"];
   [self.bridge.eventDispatcher sendAppEventWithName:@"EventReminder"
                                                body:@{@"name": eventName}];
 }
+
+@end
 ```
 
 JavaScript code can subscribe to these events: