[Access] Clarify that a new JWT scoped to App B's AUD tag is issued for linked app token requests

[jasoncabot]

Summary

The docs previously stated how linked app tokens worked but left it ambiguous as to what audience would be expected in application b. It should be obvious that it's the audience for application B that is used but this change just makes it 100% clearly documented.

Documentation checklist

• The change adheres to the documentation style guide.

[cloudflare-docs-bot]

Review

✅ No issues found in commit a9b92d7.

Code Review

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✅ No code review issues found.

Style Guide Review

✅ No style-guide issues found.

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[elithrar]

Approved for docs auto-merge.