docs(sveltekit): process.env.SENTRY_AUTH_TOKEN

[pboling]

Remove quotes around process.env.SENTRY_AUTH_TOKEN

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Contributing guidelines and verify:

• If you've added code that should be tested, please add tests.
• Ensure your code lints and the test suite passes (yarn lint) & (yarn test).

[pboling]

Worth noting that in spite of the ts in // vite.config.(js|ts) on line 208, many of the config options in this example do not work in Typescript. It's a separate issue, probably represented elsewhere in the issue tracker, but just wanted to point out that the documentation is still wrong, just slightly better.