Issue:
[DOCS] Update Rustman documentation

The current documentation misses some key points that WILL result in people not being able to run the collections and ask for help.  

We would want to update it so that it look cleaner with `Notes` that are highlighted thereby making it more readable and clearer.

Resolution:
<think>
PR Context:
- Title: docs(postman): update rustman and collection generation docs
- Merged: 2024-02-13T07:33:55Z
- Files changed: 2 files
- Commits: 3 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [x] Documentation
- [ ] CI/CD

## Description
<!-- Describe your changes in detail -->

This PR updates the `Rustman` documentation easing the collection development process along with the things to look for before running the collection.

Closes #3616

### Additional Changes

- [ ] This PR modifies the API contract
- [ 
</think>

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