Correct method name typo (GH-91970)

(cherry picked from commit c6b84a727c9299f24edbab4105ce47e9f2bae199)

Co-authored-by: Simon de Vlieger <cmdr@supakeen.com>
diff --git a/Lib/difflib.py b/Lib/difflib.py
index afd8a0c..ba0b256 100644
--- a/Lib/difflib.py
+++ b/Lib/difflib.py
@@ -837,7 +837,7 @@ def compare(self, a, b):
         Each sequence must contain individual single-line strings ending with
         newlines. Such sequences can be obtained from the `readlines()` method
         of file-like objects.  The delta generated also consists of newline-
-        terminated strings, ready to be printed as-is via the writeline()
+        terminated strings, ready to be printed as-is via the writelines()
         method of a file-like object.
 
         Example: