Add a comment about why we send onEnd from onPositionDiscontinuity when repeat is on

android-exoplayer/src/main/java/com/brentvatne/exoplayer/ReactExoplayerView.java

@@ -471,6 +471,8 @@ class ReactExoplayerView extends FrameLayout implements
             // which they seeked.
             updateResumePosition();
         }
+        // When repeat is turned on, reaching the end of the video will not cause a state change
+        // so we need to explicitly detect it.
         if (reason == ExoPlayer.DISCONTINUITY_REASON_PERIOD_TRANSITION
                 && player.getRepeatMode() == Player.REPEAT_MODE_ONE) {
             eventEmitter.end();