Add missing comma from rescanblockchain

Author: meshcollider

src/wallet/rpcwallet.cpp

@@ -3233,7 +3233,7 @@ UniValue rescanblockchain(const JSONRPCRequest& request)
             "}\n"
             "\nExamples:\n"
             + HelpExampleCli("rescanblockchain", "100000 120000")
-            + HelpExampleRpc("rescanblockchain", "100000 120000")
+            + HelpExampleRpc("rescanblockchain", "100000, 120000")
             );
     }