Update obsolete function "read_image" to "decode_image"

[oussamachaib]

Replacing obsolete function read_image with its up-to-date equivalent decode_image in data tutorials

Fixes #3370

Description

Replaces obsolete function in the data loaders 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.

cc @datumbox @nairbv @fmassa @NicolasHug @YosuaMichael

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3371

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As of commit d307fc7 with merge base ddd40ec ():
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[svekars]

cc: @NicolasHug

[NicolasHug]

Thanks @oussamachaib