Fix typos and cleanup

src/rpc.cpp

@@ -618,7 +618,7 @@ void RPC::refreshAddresses() {
             zaddresses->push_back(addr);
         }
 
-        // Refresh the sent and received txs from all these zaddresses
+        // Refresh the sent and received txs from all these z-addresses
         refreshSentZTrans();
         refreshReceivedZTrans(*zaddresses);
     });
@@ -1020,4 +1020,4 @@ QString RPC::getDefaultSaplingAddress() {
     }
 
     return QString();
-}
+}