Make it clearer to the user that they haven't overridden onLogin/Register (#7237)

changelog.d/7237.misc

@@ -0,0 +1 @@
+Change log line that told user to implement onLogin/onRegister fallback js functions to a warning, instead of an info, so it's more visible.

synapse/static/client/login/js/login.js

@@ -128,8 +128,7 @@ matrixLogin.password_login = function() {
 
 matrixLogin.onLogin = function(response) {
     // clobber this function
-    console.log("onLogin - This function should be replaced to proceed.");
-    console.log(response);
+    console.warn("onLogin - This function should be replaced to proceed.");
 };
 
 var parseQsFromUrl = function(query) {

synapse/static/client/register/js/register.js

@@ -113,5 +113,5 @@ matrixRegistration.signUp = function() {
 
 matrixRegistration.onRegistered = function(hs_url, user_id, access_token) {
     // clobber this function
-    console.log("onRegistered - This function should be replaced to proceed.");
+    console.warn("onRegistered - This function should be replaced to proceed.");
 };