[ONNX] Link to the wiki (#68505) (#69544)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/69544
Test Plan: Imported from OSS
Reviewed By: malfet
Differential Revision: D32994274
Pulled By: msaroufim
fbshipit-source-id: 34d54f935799fa94516a541a241900ec205c7427
Co-authored-by: Gary Miguel <garymiguel@microsoft.com>
