Update reinforcement_q_learning.py - use named tuples rather than indices

[Rubydesic]

Description

Tutorial uses index numbers to access the values of named tuple returned from torch.max() which is a little unclear. This changes it to use the names "indices" and "values" instead. This is a trivial change so I did not make a separate issue.

Checklist

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

cc @vmoens @nairbv

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2689

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As of commit b836b7b with merge base 51a3f60 ():
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[vmoens]

Thanks it's cleaner like this!