[Tutorial][PTD] Deprecate Training Transformer models using Distributed Data Parallel and Pipeline Parallelism and redirect the page to parallelism APIs

[wz337]

Fixes #ISSUE_NUMBER

Description

As title.

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]

🔗 Helpful Links

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