Typo fix for 'noFineGrainedAccess'

[nguyenalex836]

Why:

Closes: https://github.com/github/docs-content/issues/16988

What's being changed (if available, include any code snippets, screenshots, or gifs):

Fixing typo in variable 'noFineGrainedAccess'

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require a SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the preview environment.

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[github-actions]

👋 Hey there spelunker. It looks like you've modified some files that we can't accept as contributions:

• src/rest/components/RestAuth.tsx

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