Update auth.md (unitycatalog#531)

**PR Checklist**

- [X] A description of the changes is added to the description of this
PR.
- [ ] If there is a related issue, make sure it is linked to this PR.
- [ ] If you've fixed a bug or added code that should be tested, add
tests!
- [ ] If you've added or modified a feature, documentation in `docs` is
updated

**Description of changes**
Clarification of Identity providers supported

<!-- Please state what you've changed and how it might affect the users.
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Signed-off-by: Denny Lee <denny.g.lee@gmail.com>
Signed-off-by: Vikrant Puppala <vikrant.puppala@databricks.com>

docs/server/auth.md

@@ -20,7 +20,7 @@ To try out authentication and authorization, first configure your preferred exte
 * [Optional] `ui/.env` so the Unity Catalog UI can also use the same `client_id`.  
 
 !!! note "Unity Catalog UI supported Identity Authentication Providers"
-    Currently, the Unity Catalog User Interface supports Google, Okta, and Keyclock
+    Currently, the Unity Catalog User Interface supports Google Identity Provider.
 
 You can follow [these instructions](./google-auth.md) if would like to use Google as your external identity provider.
 
@@ -332,4 +332,4 @@ REACT_APP_GOOGLE_AUTH_ENABLED=false
 REACT_APP_GOOGLE_CLIENT_ID=
 ```
 
-Restarting your UC server (i.e., `bin/start-uc-server`)  and UI (i.e., `yarn start`) will open a new browser window with the Google Auth login.  In this case, there will be **no profile menu nor any login screen** but you will be able to see your UC assets. 
+Restarting your UC server (i.e., `bin/start-uc-server`)  and UI (i.e., `yarn start`) will open a new browser window with the Google Auth login.  In this case, there will be **no profile menu nor any login screen** but you will be able to see your UC assets.