Fix typo in AOBaseConfig docstring

[PlatformLC]

Summary

Fix a small typo in the AOBaseConfig class docstring: a stray word a was
left between to and apply, making the sentence read how to a apply it
instead of how to apply it.

Changes

• torchao/core/config.py: how to a apply it to a model → how to apply it to a model (docstring only).

Notes

• Docstring-only change; no functional or behavioral impact, no test changes needed.

[pytorch-bot]

🔗 Helpful Links

🧪 See artifacts and rendered test results at hud.pytorch.org/pr/pytorch/ao/4954

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