bpo-43935: Fix typo in Turtle.back() docstring (GH-25581)
'e ,' to 'e, '.
diff --git a/Lib/turtle.py b/Lib/turtle.py
index 08c5b47..7d94720 100644
--- a/Lib/turtle.py
+++ b/Lib/turtle.py
@@ -1645,7 +1645,7 @@ def back(self, distance):
Argument:
distance -- a number
- Move the turtle backward by distance ,opposite to the direction the
+ Move the turtle backward by distance, opposite to the direction the
turtle is headed. Do not change the turtle's heading.
Example (for a Turtle instance named turtle):