Update data_tutorial.py and added missing import in the example

[mourra950]

added Missing import for the custom Image Dataset class

Fixes #

Description

added Missing import for the custom Image Dataset class in the documentation

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.

[pytorch-bot]

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🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/2779

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