[FX][2/2] Make docstrings pretty when rendered

[jamesr66a]

Stack from ghstack:

• [FX] Add FX page to docs #48814 [WIP][FX] Add FX page to docs
• [FX][2/2] Make docstrings pretty when rendered #48871 [FX][2/2] Make docstrings pretty when rendered

Differential Revision: D25351588

[dr-ci]

💊 CI failures summary and remediations

As of commit 594f1ec (more details on the Dr. CI page):

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✅ None of the CI failures appear to be your fault 💚

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• 1/1 broken upstream at merge base e3893b8 since Dec 07

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🚧 1 ongoing upstream failure:

These were probably caused by upstream breakages that are not fixed yet:

• pytorch_xla_linux_bionic_py3_6_clang9_test since Dec 07
  • 🔁 rerun

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This comment has been revised 7 times.

[suo]

er, seems fine?

[facebook-github-bot]

@jamesr66a merged this pull request in c92c859.