Update translation_transformer.py

[vroomgit]

Calling yieldtokens() results in an attribute error if portalock library isn't installed. This needs to be installed before importing the dataset from torchtext.datasets. This was solved on a stackoverflow post: https://stackoverflow.com/questions/76302971/question-in-pytorch-transformer-tutorial-about-nonetype-object-has-no-attribut

Also recommend to add comment on ipynb notebook on https://pytorch.org/tutorials/beginner/translation_transformer.html

Fixes #ISSUE_NUMBER

Description

Added comments on line 24 and 25 to install portalock dependency.

Checklist

• [ x] The issue that is being fixed is referred in the description (see above "Fixes #ISSUE_NUMBER")
• [ x] Only one issue is addressed in this pull request
• [ x] Labels from the issue that this PR is fixing are added to this pull request
• [ x] No unnecessary issues are included into this pull request.

cc @pytorch/team-text-core @Nayef211

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