docs(crashlytics): clarify code example

ref: NativeScript/docs-v8#89

Author: rigor789

packages/firebase-crashlytics/README.md

@@ -66,7 +66,7 @@ As Crashlytics will be sending certain information regarding the user, users may
 ```ts
 import { firebase } from '@nativescript/firebase-core';
 
-firebase().crashlytics().setCrashlyticsCollectionEnabled(true);
+firebase().crashlytics().setCrashlyticsCollectionEnabled(false);
 ```
 
 ## License