Update kth_element_from_end docstring

Author: martinoywa

data_structures/linked_list/kth_element_from_end.py

@@ -55,7 +55,10 @@ def add(self, item: Any, position: int = 0) -> None:
 
     def kth_element_from_end(self, k: int) -> Any:
         """
-        Find the kth node from the end of the Linked List
+        Find the kth node element from the end of the Linked List.
+        This is not a zero-based index search.
+        If k=1, it will return the last element in the list.
+
         >>> linked_list = LinkedList()
         >>> linked_list.add(1)
         >>> linked_list.add(2)