[FX] Minor fixups in Graph printout (#44214)
Summary: Pull Request resolved: https://github.com/pytorch/pytorch/pull/44214
Test Plan: Imported from OSS
Reviewed By: suo
Differential Revision: D23545501
Pulled By: jamesr66a
fbshipit-source-id: dabb3b051ed4da213b2087979ade8a649288bd5d
