[issue43935] Fix typo in Turtle.back docstring

[Terry J. Reedy]

Terry J. Reedy <tjreedy at udel.edu> added the comment:


New changeset e377ecf3b496c7719e6dffe3ebf3d0ef512cfb5b by Miss Islington (bot) in branch '3.8':
bpo-43935: Fix typo in Turtle.back() docstring (GH-25581)
https://github.com/python/cpython/commit/e377ecf3b496c7719e6dffe3ebf3d0ef512cfb5b


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