changed comment to jdoc type

Author: aivelon

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

@@ -509,8 +509,13 @@ public static void openCommentRepliesFragment(@NonNull final FragmentActivity ac
                 .commit();
     }
 
-    // This removes all of the top CommentRepliesFragment instances.
-    // Ideally there should only be one since we remove existing before opening a new one.
+    /**
+     * Closes all open {@link CommentRepliesFragment}s in {@code activity},
+     * including those that are not at the top of the back stack.
+     * This is needed to prevent multiple open CommentRepliesFragments
+     * Ideally there should only be one since we remove existing before opening a new one.
+     * @param activity the activity in which to close the CommentRepliesFragments
+     */
     public static void closeCommentRepliesFragments(@NonNull final FragmentActivity activity) {
         final FragmentManager fm = activity.getSupportFragmentManager();