Fixed "putExtra" typo in HeadlessJSAndroid

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Improved documents by fixing a typo

No code was changed

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Closes facebook#16643

Differential Revision: D6241688

Pulled By: hramos

fbshipit-source-id: ffe6f8be369c95bb16fe82719dfc943bb6223191

Author: alpparkan

docs/HeadlessJSAndroid.md

@@ -90,7 +90,7 @@ Following lines shows part of Android manifest file for registering broadcast re
 </receiver>
 ```
 
-Broadcast receiver then handles intent that was broadcasted in onReceive function. This is a great place to check whether your app is on foreground or not. If app is not on foreground we can prepare our intent to be started, with no information or additional information bundled using putExta (keep in mind bundle can handle only parcelable values). In the end service is started and wakelock is acquired.
+Broadcast receiver then handles intent that was broadcasted in onReceive function. This is a great place to check whether your app is on foreground or not. If app is not on foreground we can prepare our intent to be started, with no information or additional information bundled using putExtra (keep in mind bundle can handle only parcelable values). In the end service is started and wakelock is acquired.
 
 ```java
 public class NetworkChangeReceiver extends BroadcastReceiver {