fix(docs): fix reference payment nonexistent docs (#736)

Author: nikerzetic-aflabs

docs/fdc/attestation-types/referenced-payment-nonexistence.mdx

@@ -74,7 +74,7 @@ The verification process is chain-specific, with details described below.
 - The transaction **must not be a coinbase transaction**.
 - The transaction must include the specified [standard payment reference](#standard-payment-reference).
 - If `checkSourceAddresses` is set to true, the `sourceAddressesRoot` of the transaction must match the specified `sourceAddressesRoot`.
-- The sum of all output values sent to the specified address **minus** the sum of all input values from the same address must be **greater than the specified `amount`**.
+- The sum of all output values sent to the specified address **minus** the sum of all input values from the same address must be **greater or equal to the specified `amount`**.
   - Typically, the sum of input values for the specified address is zero.
 
 #### Timestamp
@@ -89,8 +89,8 @@ The verification process is chain-specific, with details described below.
 - The transaction must include the specified [standard payment reference](#standard-payment-reference).
 - If `checkSourceAddresses` is set to true, the `sourceAddressesRoot` of the transaction must match the specified `sourceAddressesRoot`.
 - One of the following conditions must hold:
-  - The transaction status is `SUCCESS` and the amount received by the specified address is greater than the specified `amount`.
-  - The transaction status is `RECEIVER_FAILURE` and the specified address would have received an amount greater than the specified `amount` if the transaction had succeeded.
+  - The transaction status is `SUCCESS` and the amount received by the specified address is greater or equal to the specified `amount`.
+  - The transaction status is `RECEIVER_FAILURE` and the specified address would have received an amount greater or equal to the specified `amount` if the transaction had succeeded.
 
 #### Timestamp