Update beginner_source/README.txt

[jaketae]

This PR updates/corrects the link to the PyTorch transformer translation tutorial.

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[jaketae]

Hey @bigfootjon, master still appears to have an obsolete link to the tutorial. I'm curious to know why this PR was closed? This seems like a very small, trivial change to me, but of course there might be details I'm missing. Thanks!

[bigfootjon]

Hi @jaketae, this was mistakenly closed due to a mixup with the default branch name. Unfortunately, I can't reopen the PR because the old master branch was deleted. Please create a new PR and reference this PR.

[jaketae]

@bigfootjon Will do, I appreciate the explanation.