Improve prettier troubleshooting doc: add npx tsc.

[konrad-jamrozik]

This PR is made by the Azure SDK Engineering System team. This PR is making improvements to documentation at https://aka.ms/ci-fix

This doc update is necessary as a result of the following update:

• TypeScript compilation fails in azure-rest-api-specs pipelines azure-sdk-tools#6109

More context provided in this internal Teams chat

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Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

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️️✔️Breaking Change(Cross-Version) succeeded [Detail] [Expand]

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️️✔️ApiReadinessCheck succeeded [Detail] [Expand]

️️✔️~[Staging] ServiceAPIReadinessTest succeeded [Detail] [Expand]

Validation passes for ServiceAPIReadinessTest.

️️✔️SwaggerAPIView succeeded [Detail] [Expand]

️️✔️CadlAPIView succeeded [Detail] [Expand]

️️✔️TypeSpecAPIView succeeded [Detail] [Expand]

️️✔️ModelValidation succeeded [Detail] [Expand]

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️️✔️SemanticValidation succeeded [Detail] [Expand]

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️️✔️CadlValidation succeeded [Detail] [Expand]

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_{Posted by Swagger Pipeline | How to fix these errors?}

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Swagger pipeline restarted successfully, please wait for status update in this comment.

[openapi-pipeline-app]

Swagger pipeline started successfully. If there is ApiView generated, it will be updated in this comment.

[konrad-jamrozik]

@weshaggard @mikeharder Looks like running npx tsc is causing updates to npm dependencies that want to get commited to the repo, per this Teams comment. Not sure what is the best way forward here.