Fix broken links to torch.export documentation

[rtj1]

Summary

• Fixes broken 404 links to pytorch.org/docs/main/export.html which have moved to docs.pytorch.org/docs/stable/user_guide/torch_compiler/export.html

Files Updated

• recipes_source/torch_export_challenges_solutions.rst - Fixed link to existing-frameworks section
• unstable_source/openvino_quantizer.rst - Fixed link to torch export mechanism

Fixes #3712

cc @svekars @sekyondaMeta @AlannaBurke

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/tutorials/3747

• 📄 Preview Python docs built from this PR

Note: Links to docs will display an error until the docs builds have been completed.

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