fix 1.7.1 document version number

[mattip]

As pointed out in this comment, the title of the stable (1.7.1) docs showed 1.7.0. It is not clear how the documents were generated that way.

Here is the script I used to generate this:

cd docs/1.7.1
for f in $(find . -name '*.html'); do echo $f; sed -i -e's/PyTorch 1.7.0 doc/PyTorch 1.7.1 doc/' $f; done

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[mattip]

@brianjo

[brianjo]

Thanks Matti!