shoaib3/issue#5229

fixed some code formettings

Author: sshaikshoaib

src/main/java/com/thealgorithms/datastructures/lists/SinglyLinkedList.java

@@ -392,7 +392,7 @@ public int poll() {
         head = head.next;
         size--; // As head is removed size will be decreased
         return headValue;
-        }
+    }    
 
     /**
      * @param position to check position