[BUG] ddp_pipeline.html is outdated

[svekars]

Add Link

https://pytorch.org/tutorials/advanced/ddp_pipeline.html

Describe the bug

This tutorial is similar to https://pytorch.org/tutorials/beginner/transformer_tutorial.html which we have identified for deprecation in #2774. Proposing to deprecate unless the distributed team updates.

@H-Huang @andrew Gu @wz337

Describe your environment

N/A

cc @wconstab @osalpekar @H-Huang @kwen2501