quant docs: add and clean up InstanceNorm{n}d

[vkuzo]

Stack from ghstack:

• quant docs: add and clean up ELU #40377 quant docs: add and clean up ELU
• quant docs: add and clean up BatchNorm{n}d #40346 quant docs: add and clean up BatchNorm{n}d
• quant docs: add and clean up InstanceNorm{n}d #40345 quant docs: add and clean up InstanceNorm{n}d
• quant docs: add and clean up GroupNorm #40343 quant docs: add and clean up GroupNorm
• quant docs: add and clean up LayerNorm #40342 quant docs: add and clean up LayerNorm
• quant docs: add and clean up hardtanh #40341 quant docs: add and clean up hardtanh
• quant docs: add and clean up hardsigmoid #40340 quant docs: add and clean up hardsigmoid
• quant docs: clean up hardswish #40323 quant docs: clean up hardswish

Fixes docstrings and adds to quantization docs for quantized InstanceNorm.

Test plan:

• build on Mac OS and inspect

Differential Revision: D22152637

[dr-ci]

💊 CI failures summary and remediations

As of commit b08d1f4 (more details on the Dr. CI page):

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💚 💚 Looks good so far! There are no failures yet. 💚 💚

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This comment has been revised 12 times.

[facebook-github-bot]

@vkuzo merged this pull request in 5e68351.