Fix quantization.md Table Format

[Jack-Khuu]

There were too many column headers resulting in the documentation not generating a rich table component. This fixes it

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/torchchat/876

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❌ 2 New Failures, 2 Unrelated Failures

As of commit 81afb2b with merge base 24aaff3 ():

NEW FAILURES - The following jobs have failed:

• pull / test-mps-dtype / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 128
• Run the README instructions - with stories - on MPS/MacOS / test-gguf-mps-macos / macos-job (gh)
  The process '/usr/bin/git' failed with exit code 128

FLAKY - The following jobs failed but were likely due to flakiness present on trunk:

• Run the README instructions - with stories - on MPS/MacOS / test-quantization-mps-macos / macos-job (gh) (detected as infra flaky with no log or failing log classifier)
• Run the README instructions - with stories - on MPS/MacOS / test-readme-mps-macos / macos-job (gh) (detected as infra flaky with no log or failing log classifier)

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