Update api-reference/introduction.mdx

Co-authored-by: Sanchith Hegde <22217505+SanchithHegde@users.noreply.github.com>

api-reference/introduction.mdx

@@ -59,5 +59,5 @@ The available parameters are as follows:
 - **status** - can have values of `succeeded`, `processing`and `failed`
 - **payment_intent_client_secret** - This is the client secret associated with the payment. This can be used to retrieve the payment status from hyperswitch.
 - **manual_retry_allowed** - whether this payment can be retried or not.
-- **signature** - A Hmac signature of the payload, this can be verified using the payment_response_hash_key
+- **signature** - A HMAC signature of the payload, this can be verified using the `payment_response_hash_key`.
 - **signature_algorithm** - The HMAC algorithm used to calculate the signature.