Add link to CAS doc

doc/integration/README.md

@@ -8,6 +8,7 @@ See the documentation below for details on how to configure these services.
 - [LDAP](ldap.md) Set up sign in via LDAP
 - [OmniAuth](omniauth.md) Sign in via Twitter, GitHub, GitLab, and Google via OAuth.
 - [SAML](saml.md) Configure GitLab as a SAML 2.0 Service Provider
+- [CAS](cas.md) Configure GitLab to sign in using CAS
 - [Slack](slack.md) Integrate with the Slack chat service
 - [OAuth2 provider](oauth_provider.md) OAuth2 application creation
 - [Gmail actions buttons](gmail_action_buttons_for_gitlab.md) Adds GitLab actions to messages

doc/integration/cas.md

 # CAS OmniAuth Provider
 
-To enable the CAS OmniAuth provider you must register your application with your CAS instance. This requires the service URL gitlab will supply to CAS. It should be something like: `https://gitlab.example.com:443/users/auth/cas3/callback?url`. By default handling for SLO is enabled, you only need to configure CAS for backchannel logout.
+To enable the CAS OmniAuth provider you must register your application with your CAS instance. This requires the service URL GitLab will supply to CAS. It should be something like: `https://gitlab.example.com:443/users/auth/cas3/callback?url`. By default handling for SLO is enabled, you only need to configure CAS for backchannel logout.
 
 1.  On your GitLab server, open the configuration file.
 
@@ -10,7 +10,7 @@ To enable the CAS OmniAuth provider you must register your application with your
       sudo editor /etc/gitlab/gitlab.rb
     ```
 
-    For instalations from source:
+    For installations from source:
 
     ```sh
       cd /home/git/gitlab