Update backend.py

Author: SidMehta

BrowserHistory/backend.py

@@ -2,7 +2,8 @@ class DLL:
     """
         a doubly linked list that holds the current page,
         next page, and previous page.
-        Used to enforce order in operations
+        Used to enforce order in operations.
+        This is a change to the file
     """
     def __init__(self, val: str =None):
         self.val = val
@@ -78,4 +79,4 @@ def forward(self, steps: int) -> str:
     param_3 = obj.forward(1)
 
     print(param_2)
-    print(param_3)
+    print(param_3)