Improved documentation

app/src/main/java/org/schabi/newpipe/QueueItemMenuUtil.java

@@ -56,6 +56,9 @@ public final class QueueItemMenuUtil {
                                     .show(fragmentManager, "QueueItemMenuUtil@append_playlist"));
                     return true;
                 case R.id.menu_item_channel_details:
+                    // An intent must be used here.
+                    // Opening with FragmentManager transactions is not working,
+                    // as PlayQueueActivity doesn't use fragments.
                     NavigationHelper.openChannelFragmentUsingIntent(context, item.getServiceId(),
                             item.getUploaderUrl(), item.getUploader());
                     return true;

app/src/main/java/org/schabi/newpipe/util/NavigationHelper.java

@@ -491,11 +491,15 @@ public final class NavigationHelper {
         context.startActivity(intent);
     }
 
-    /////////////////////////////////////////////////////
+    /**
-    // PlayQueueActivity doesn't use fragments so the  //
+     * Opens {@link ChannelFragment}.
-    // openChannelFragment method can't be used        //
+     * Use this instead of {@link #openChannelFragment(FragmentManager, int, String, String)}
-    // since that uses FragmentManager transactions.   //
+     * when no fragments are used / no FragmentManager is available.
-    /////////////////////////////////////////////////////
+     * @param context
+     * @param serviceId
+     * @param url
+     * @param title
+     */
     public static void openChannelFragmentUsingIntent(final Context context,
                                                       final int serviceId,
                                                       final String url,