Fix a typo in compiler faq.rst

[navyxliu]

neuronx-cc is XLA front-end.

Description:
just fix a typo in doc.
https://awsdocs-neuron.readthedocs-hosted.com/en/latest/compiler/neuronx-cc/faq.html#neuronx-compiler-faq

MANDATORY: PR needs test run output

Test Run Output:
Please specify the release version, instance size and type, OS type and test output.

Training tutorial:
Convergence graph for training tutorials
Performance metrics average_throughput, latency_p50, latency_p99 and MFU% if available

Please make sure this PR contains correct classification terms (Alpha, Beta, and Stable).

If possible, provide your results or a link to them for the reviewer to check your work.

Issue #, sim, or t.corp if available:

Link to RTD for my changes:
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Additional context:

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Pytest Marker Checklist

(Coming soon...)

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• I've verified the changes render correctly on RTD (link above)
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[navyxliu]

hi, Reviewers,
could you take a look at this PR?