Update README.md

Zendesk only supports a single pair of SSO URLs. The remote login URL used for agents/admins is what's used for end-users & vice versa.

Specifically this is what should always be used in Zendesk under Settings > Security

Remote login URL: 
http://your_site_base_url/zendesk/sso/login

Remote logout URL: 
http://your_site_base_url/zendesk/sso/logout

It's up to the Magento Extension upon getting a request to build a login request to figure out if the email used is tied in Zendesk to either an agent/admin or an end-user & redirect accordingly.

CC @jwswj @Maxmi @mmolina

Author: jeremiahcurrier

README.md

@@ -26,15 +26,8 @@ The API can be enabled in the Zendesk settings page in the Magento admin panel.
 
 ### Single Sign-on (SSO)
 
-* Admins & Agents
-
-  Remote login URL: http://your_site_base_url/admin/zendesk/authenticate
-  Remote logout URL: http://your_site_base_url/admin/zendesk/logout
-
-* End-user
-
-  Remote login URL: http://your_site_base_url/zendesk/sso/login
-  Remote logout URL: http://your_site_base_url/zendesk/sso/logout
+  **Remote login URL** http://your_site_base_url/zendesk/sso/login
+  **Remote logout URL** http://your_site_base_url/zendesk/sso/logout
 
 ### Responses