doc: remove extraneous character

jimthompson5802 · jimthompson5802 · commit 7b443fb7f4db · 2021-11-14T19:54:42.000-05:00
diff --git a/beginner_source/examples_autograd/polynomial_custom_function.py b/beginner_source/examples_autograd/polynomial_custom_function.py
@@ -1,5 +1,5 @@
 # -*- coding: utf-8 -*-
-r"""
+"""
 PyTorch: Defining New autograd Functions
 ----------------------------------------
 

-Original file line number
+Diff line change
@@ @@ -1,5 +1,5 @@ @@
 # -*- coding: utf-8 -*-
 -r"""
 +"""
 PyTorch: Defining New autograd Functions
 ----------------------------------------