Issue:
Adding information about decimal and non decimal currencies

There is lack of information about decimal and non decimal currencies in the documentation.

Resolution:
<think>
PR Context:
- Title: docs: Correction for JPY in API Ref
- Merged: 2024-09-11T07:51:57Z
- Files changed: 3 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 -->


### 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 ch
</think>

To implement this, you'll need to modify:


**Detailed Implementation:**


**Commit 1:** docs: Correction for JPY in API Ref (#5853)
Files to modify:


**crates/api_models/src/payments.rs**
  Modify existing code