Add descriptions

Author: XomaDev

src/test/java/com/thealgorithms/datastructures/queues/LinkedQueueTest.java

@@ -19,6 +19,8 @@ public void testQue() {
 
     final int[] element = { 1 };
 
+    // iterates over al the elements present
+    // as in the form of nodes
     queue.forEach(integer -> {
       if (element[0]++ != integer)
         throw new AssertionError();