[reland][quant][docs] Add fx graph mode quantization to quantization docs (#49211)

[jerryzh168]

Stack from ghstack:

• [reland][quant][docs] Add fx graph mode quantization to quantization docs (#49211) #49515 [reland][quant][docs] Add fx graph mode quantization to quantization docs ([quant][docs] Add fx graph mode quantization to quantization docs #49211)

Summary:

Test Plan: Imported from OSS

Reviewed By: raghuramank100

Differential Revision: D25601061

[facebook-github-bot]

💊 CI failures summary and remediations

As of commit a54a2dc (more details on the Dr. CI page):

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• 1/2 failures possibly* introduced in this PR
  • 1/1 non-CircleCI failure(s)
• 1/2 broken upstream at merge base 399b07a on Dec 16 from 10:17am to 5:52pm

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🚧 1 fixed upstream failure:

These were probably caused by upstream breakages that were already fixed.

Please rebase on the viable/strict branch (expand for instructions)

If your commit is older than viable/strict, run these commands:

git fetch https://github.com/pytorch/pytorch viable/strict
git rebase FETCH_HEAD

Check out the recency history of this "viable master" tracking branch.

• binary_linux_libtorch_3_7m_cpu_devtoolset7_shared-with-deps_test on Dec 16 from 10:17am to 5:52pm (c52f1dc - a5cc0a6)
  • 🔁 rerun

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ci.pytorch.org: 1 failed

• Failed: pr/pytorch-linux-bionic-rocm3.9-py3.6

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This comment has been revised 6 times.

[facebook-github-bot]

This pull request has been merged in b8d98f0.