Remove placeholder text from Referral Program section

Author: 34r7h

applications/XMBL.md

@@ -259,8 +259,8 @@ This section should break the development roadmap down into milestones and deliv
 
 You can find more information about the program [here](https://grants.web3.foundation/docs/referral-program).
 
-- **Referrer:** [Name of the Polkadot Ambassador or GitHub account of the Web3 Foundation grantee]
-- **Payment Address:** [Polkadot/Kusama (USDC) payment address. Please also specify the currency.]
+- **Referrer:** N/A
+- **Payment Address:** N/A
 
 ## Additional Information ➕