docs: Improve example by adding missing import

[avitase]

Fixes #3050

Description

The example "Creating a Custom Dataset for your files" was missing the import from torch.utils.data import Dataset. Since other imports are shown and the purpose of this example is to show how to create a custom dataset, this import is crucial and should be added.

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 @subramen @albanD @jbschlosser

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3051

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[svekars]

This is already imported on line 49:

tutorials/beginner_source/basics/data_tutorial.py

Line 49 in 8a8331e

from torch.utils.data import Dataset

[avitase]

That's true. Still, I was first confused after reading only this section of the doc. Ultimately, it is not a huge deal but at least I would have wished to have this import next to the example.