Issue:
chore(openapi): reformat and fix typos

## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [x] Bugfix
- [ ] New feature
- [ ] Enhancement
- [x] Refactoring
- [ ] Dependency updates

## Description
<!-- Describe your changes in detail -->

(If you're reviewing, it's better to follow changes in each commit, except for the first one. For the first commit, check [diff without whitespace changes](https://github.com/juspay/orca/commit/892fce6309a0c7e166cb90ce122a9152e09544d4?w=1).)

This PR includes the following changes:

- Re-formats the OpenAPI spec YAML file to use 2 spaces instead of 4 for indentation.
  - I just ran the [Prettier VS Code Extension](https://github.com/prettier/prettier-vscode) on the file.
  - View the diff for the commit without whitespace changes [here](https://github.com/juspay/orca/commit/892fce6309a0c7e166cb90ce122a9152e09544d4?w=1).
- Updates the base URLs in the description to be clickable links.
- Replaces some occurrences of `jarnura` and `Arun Raj` with placeholders.
- Fixes typos in the OpenAPI spec file (~50 of them)
- Re-generates the Postman collection from the OpenAPI spec file.

## Motivation and Context
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Why is this change required? What problem does it solve?
If it fixes an open issue, please link to the issue here.

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This PR paves the way for including a "quick start" section in the OpenAPI spec and the Postman collection, which will be made in a separate PR.

## How did you test it?
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Did you write an integration/unit/API test to verify the code changes?
Or did you test this change manually (provide relevant screenshots)?
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N/A

## Checklist
<!-- Put an `x` in the boxes that apply -->

- [ ] I formatted the code `cargo +nightly fmt`
- [ ] I addressed lints thrown by `cargo clippy`
- [x] I reviewed submitted code
- [ ] I added unit tests for my changes where possible
- [ ] I added a [CHANGELOG](/CHANGELOG.md) entry if applicable


Resolution:
<think>
PR Context:
- Title: docs(openapi): introduce a `QuickStart` tag
- Merged: 2023-01-03T12:32:42Z
- Files changed: 2 files
- Commits: 5 commits

Implementation approach:
## Type of Change
<!-- Put an `x` in the boxes that apply -->

- [ ] Bugfix
- [ ] New feature
- [x] Enhancement
- [ ] Refactoring
- [ ] Dependency updates

## Description
<!-- Describe your changes in detail -->
This PR builds on top of changes made in #263 and includes a `QuickStart` tag and folder in the OpenAPI spec and Postman collection, respectively. This targets the branch for #263 (for better diffs) and hence, it's preferable that #263 is merged first. (If you're reviewing, it
</think>

To implement this, you'll need to modify:


(No detailed commit information available)