[Doc] [Clusters] Add missing steps and simplify YAML in top-level clusters quickstart

[architkulkarni]

Why are these changes needed?

Closes #35299 by adding missing steps and using a minimal cluster YAML file.

Addresses #33026 for the AWS example-minimal.yaml by adding min_workers, max_workers and the instance type. The issue will remain open until it's fixed for all the other cluster provider example-minimal YAML files as well.

I'll run through the final tutorial manually once before merging.

Related issue number

Checks

• I've signed off every commit(by using the -s flag, i.e., git commit -s) in this PR.
• I've run scripts/format.sh to lint the changes in this PR.
• I've included any doc changes needed for https://docs.ray.io/en/master/.
  • I've added any new APIs to the API Reference. For example, if I added a
    method in Tune, I've added it in doc/source/tune/api/ under the
    corresponding .rst file.
• I've made sure the tests are passing. Note that there might be a few flaky tests, see the recent failures at https://flakey-tests.ray.io/
• Testing Strategy
  • Unit tests
  • Release tests
  • This PR is not tested :(

[rynewang]

newline?

[architkulkarni]

The script passed:

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