Add missing documentation.

Author: DxsSucuk

src/main/java/me/catcoder/sidebar/Sidebar.java

@@ -158,13 +158,22 @@ public void shiftLine(SidebarLine<R> line, int offset) {
      *
      * @param task - task to bind
      * @return the task
+     *
+     * @deprecated Use {@link #bindWrappedTask(WrappedTask)} instead.
      */
     @Deprecated(since = "6.2.9")
     public BukkitTask bindBukkitTask(@NonNull BukkitTask task) {
         this.tasks.add(new WrappedBukkitTask(task));
         return task;
     }
 
+    /**
+     * Binds a {@link WrappedTask} to this sidebar.
+     * When the sidebar is destroyed, the task will be cancelled.
+     *
+     * @param task - task to bind
+     * @return the task
+     */
     public WrappedTask bindWrappedTask(@NonNull WrappedTask task) {
         this.tasks.add(task);
         return task;