Update walletkit/react-native/eip5792.mdx

Co-authored-by: Jakub Witczak <jakubwitczak6@gmail.com>

Author: rohit-710

walletkit/react-native/eip5792.mdx

@@ -219,7 +219,7 @@ This capability is expressed per chain and is crucial for determining how `walle
     ```javascript
     const scopedProperties = {
       eip155: WalletKit.buildWalletService(
-        "https://wallet-service-url.com",
+        "${bundler_url}",
         ["wallet_getCallsStatus"]
       ),
     };