Allowing setting the redirect url and text

docs/change_login.md

@@ -9,15 +9,15 @@ Usually your login function will check for username and password, log the user i
      * if user has mfa then redirect to mfa page
       * if user doesn't have mfa then call your function to create the user session
 
-<code>
-    def login(request): # this function handles the login form POST
-       user = auth.authenticate(username=username, password=password)  
-       if user is not None: # if the user object exist
-            from mfa.helpers import has_mfa
-            res =  has_mfa(username = username,request=request) # has_mfa returns false or HttpResponseRedirect
-            if res:
-                return res
-            return log_user_in(request,username=user.username) 
+```python
+def login(request): # this function handles the login form POST
+    user = auth.authenticate(username=username, password=password)  
+    if user is not None: # if the user object exist
+         from mfa.helpers import has_mfa
+         res =  has_mfa(username = username,request=request) # has_mfa returns false or HttpResponseRedirect
+         if res:
+             return res
+         return log_user_in(request,username=user.username) 
             #log_user_in is a function that handles creatung user session, it should be in the setting file as MFA_CALLBACK
-</code>
+```