Issue:
Bug: Adding information about decimal and non decimal currencies



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

Pull request description:
## Type of Change
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- [ ] 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

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2. `crates/router/src/configs`
3. `loadtest/config`
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## Motivation and Context
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Closes #5852.
## How did you test it?
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## Checklist
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- [ ] I formatted the code `cargo +nightly fmt --all`
- [ ] I addressed lints thrown by `cargo clippy`
- [ ] I reviewed the submitted code
- [ ] I added unit tests for my changes where possible


Testing:

Patch:
diff --git a/api-reference-v2/openapi_spec.json b/api-reference-v2/openapi_spec.json
index ac4f3fe7b46..ac7f5dfd2cc 100644
--- a/api-reference-v2/openapi_spec.json
+++ b/api-reference-v2/openapi_spec.json
@@ -11596,7 +11596,7 @@
           "amount": {
             "type": "integer",
             "format": "int64",
-            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and ¥100 since ¥ is a zero-decimal currency",
+            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and 1 for 1¥ since ¥ is a zero-decimal currency. Read more about [the Decimal and Non-Decimal Currencies](https://github.com/juspay/hyperswitch/wiki/Decimal-and-Non%E2%80%90Decimal-Currencies)",
             "example": 6540,
             "nullable": true,
             "minimum": 0
@@ -11960,7 +11960,7 @@
           "amount": {
             "type": "integer",
             "format": "int64",
-            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and ¥100 since ¥ is a zero-decimal currency",
+            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and 1 for 1¥ since ¥ is a zero-decimal currency. Read more about [the Decimal and Non-Decimal Currencies](https://github.com/juspay/hyperswitch/wiki/Decimal-and-Non%E2%80%90Decimal-Currencies)",
             "minimum": 0
           },
           "currency": {
@@ -12938,7 +12938,7 @@
           "amount": {
             "type": "integer",
             "format": "int64",
-            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and ¥100 since ¥ is a zero-decimal currency",
+            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and 1 for 1¥ since ¥ is a zero-decimal currency. Read more about [the Decimal and Non-Decimal Currencies](https://github.com/juspay/hyperswitch/wiki/Decimal-and-Non%E2%80%90Decimal-Currencies)",
             "example": 6540,
             "nullable": true,
             "minimum": 0
@@ -14048,7 +14048,7 @@
           "amount": {
             "type": "integer",
             "format": "int64",
-            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and ¥100 since ¥ is a zero-decimal currency",
+            "description": "The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and 1 for 1¥ since ¥ is a zero-decimal currency. Read more about [the Decimal and Non-Decimal Currencies](https://github.com/juspay/hyperswitch/wiki/Decimal-and-Non%E2%80%90Decimal-Currencies)",
             "example": 6540,
             "nullable": true,
             "minimum": 0
diff --git a/crates/api_models/src/payments.rs b/crates/api_models/src/payments.rs
index cd32c045f18..eac7c9888aa 100644
--- a/crates/api_models/src/payments.rs
+++ b/crates/api_models/src/payments.rs
@@ -278,7 +278,7 @@ pub struct CustomerDetailsResponse {
 #[generate_schemas(PaymentsCreateRequest, PaymentsUpdateRequest, PaymentsConfirmRequest)]
 #[serde(deny_unknown_fields)]
 pub struct PaymentsRequest {
-    /// The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and ¥100 since ¥ is a zero-decimal currency
+    /// The payment amount. Amount for the payment in the lowest denomination of the currency, (i.e) in cents for USD denomination, in yen for JPY denomination etc. E.g., Pass 100 to charge $1.00 and 1 for 1¥ since ¥ is a zero-decimal currency. Read more about [the Decimal and Non-Decimal Currencies](https://github.com/juspay/hyperswitch/wiki/Decimal-and-Non%E2%80%90Decimal-Currencies)
     #[schema(value_type = Option<u64>, example = 6540)]
     #[serde(default, deserialize_with = "amount::deserialize_option")]
     #[mandatory_in(PaymentsCreateRequest = u64)]