chore: fix typos in src/main/java/com/thealgorithms/devutils/nodes/SimpleNode.java (#7031)

Fix typos in src/main/java/com/thealgorithms/devutils/nodes/SimpleNode.java

Co-authored-by: a <19151554+alxkm@users.noreply.github.com>

Author: Lê Nam Khánh

src/main/java/com/thealgorithms/devutils/nodes/SimpleNode.java

@@ -15,7 +15,7 @@ public class SimpleNode<E> extends Node<E> {
     private SimpleNode<E> nextNode;
 
     /**
-     * Empty contructor.
+     * Empty constructor.
      */
     public SimpleNode() {
         super();