docs(oauth): shorten the setting description

Author: EhabY

package.json

@@ -184,7 +184,7 @@
 					"scope": "application"
 				},
 				"coder.oauth.enabled": {
-					"markdownDescription": "Offer [OAuth 2.1](https://coder.com/docs/admin/integrations/oauth2-provider) authentication during login when supported by the deployment. OAuth provides automatic token refresh. Session token authentication remains available.",
+					"markdownDescription": "Offer [OAuth 2.1](https://coder.com/docs/admin/integrations/oauth2-provider) authentication during login when supported by the deployment. OAuth provides automatic token refresh.",
 					"type": "boolean",
 					"default": false,
 					"scope": "application"