update links to dbt pages

[mirnawong1]

This pr adds some follow up changes from #25 made from @dataders. it updates the following:

• change casing from DBT to dbt
• adds link to dbt cloud fabric set up and turns link options into bullets

[prmerger-automator]

@mirnawong1 : Thanks for your contribution! The author(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 935e889:

✅ Validation status: passed

File	Status	Preview URL	Details
docs/data-warehouse/connectivity.md	✅Succeeded

For more details, please refer to the build report.

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[ttorble]

@WilliamDAssafMSFT

Can you review the proposed changes?

IMPORTANT: When the changes are ready for publication, adding a #sign-off comment is the best way to signal that the PR is ready for the review team to merge.

#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

[WilliamDAssafMSFT]

Thanks @mirnawong1! This commit is being pulled internally and is in flight to be published soon. Thanks for contributing to make Microsoft documentation more accurate! To return the favor, I've created dbt-labs/docs.getdbt.com#6945.

[mirnawong1]

hey @WilliamDAssafMSFT , thanks so much for your quick review! really appreciate it and will take a look at your pr 🙏