Issue: [BUG] Description for refunds - list is not apt

### Bug Description

https://api-reference.hyperswitch.io/api-reference/refunds/refunds--list

This should be - `Lists all the refunds associated with the merchant, or for a specific payment if payment_id is provided`

Current one implies that it'll return refunds of a payment_id if it is not provided.

### Expected Behavior

It should reflect that refunds accociated with a merchant will be returned if payment_id is missing, otherwise only for that payment_id.

### Actual Behavior

Incorrect message being shown.

### Steps To Reproduce

Visit - https://api-reference.hyperswitch.io/api-reference/refunds/refunds--list



### Context For The Bug

_No response_

### Environment

Are you using hyperswitch hosted version? Yes



### Have you spent some time checking if this bug has been raised before?

- [X] I checked and didn't find a similar issue

### Have you read the Contributing Guidelines?

- [X] I have read the [Contributing Guidelines](https://github.com/juspay/hyperswitch/blob/main/docs/CONTRIBUTING.md)

### Are you willing to submit a PR?

Yes, I am willing to submit a PR!

Resolution: <think>
PR Context:
- Title: fix(docs): incorrect description for refund api
- Merged: 2024-12-10T11:02:10Z
- Files changed: 2 files
- Commits: 4 commits

Implementation approach:
## Type of Change

- [ ] Bugfix
- [ ] New feature
- [ ] Enhancement
- [ ] Refactoring
- [ ] Dependency updates
- [x] Documentation
- [ ] CI/CD

## Description
The current description for refund - list is incorrect. Newer one looks more apt.


### Additional Changes

- [ ] This PR modifies the API contract
- [ ] This PR modifies the database schema
- [ ] This PR modifies application configuration/environment variables

<!--
Provide links to the files with corresponding change
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** fix(docs): incorrect description for refund api (#6443)
Signed-off-by: Shashank Kumar <shashankkumar
Files to modify:


**crates/openapi/src/routes/refunds.rs**
  Modify existing code