chore(docs): Update example for remote backend to show cloud backend

[mutahhir]

Description

We had already updated the Remote backends documentation to use the Cloud backend, but overlooked the paragraphs following the updated example code. This PR updates that to be more accurate.

Checklist

• I have updated the PR title to match CDKTF's style guide
• I have run the linter on my code locally
• I have performed a self-review of my code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation if applicable
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works if applicable
• New and existing unit tests pass locally with my changes