Remove outdated Google Docs link from compiled_autograd_tutorial

[patrocinio]

The tutorial was pointing to a Google Docs page that is no longer maintained and not well indexed. Many of the restrictions mentioned in that document have since been lifted.

Changes:

• Removed the Google Docs link reference
• Updated the note to reflect that many restrictions have been lifted
• Added a link to PyTorch GitHub Issues for reporting problems
• Made the note more user-friendly and actionable

This makes the tutorial more discoverable and directs users to the proper channels for reporting issues or asking questions.

Fixes #3627

Description

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.