Minor NestJS guide corrections

[mawentowski]

Summary of change

I corrected an error in the NestJS guide's CORS setup section, replacing 'AuthModule' with 'AppModule'. I also corrected the relative path of an import statement.

Checklist

• [ ] Algolia search needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Sitemap needs to be updated? (If there is a new sub docs project, then yes)
• [ ] Checked for broken links? (Run cd v2 && MODE=production npx docusaurus build)
• [ ] Changes required to the demo apps corresponding to the docs?

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