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

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[navyxliu]

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