Updated docs and config example

config/gitlab.yml.example

@@ -893,7 +893,7 @@ production: &base
     # Define the allowed providers using an array, e.g. ["saml", "twitter"], or as true/false to
     # allow all providers or none.
     # (default: false)
-    auto_link_user: ["saml"]
+    auto_link_user: ["saml", "twitter"]
 
     # Set different Omniauth providers as external so that all users creating accounts
     # via these providers will not be able to have access to internal projects. You

doc/integration/omniauth.md

@@ -144,7 +144,8 @@ The chosen OmniAuth provider is now active and can be used to sign in to GitLab
 
 > [Introduced in GitLab 13.4.](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/36664)
 
-You can automatically link OmniAuth users with existing GitLab users if their email addresses match by adding the following setting:
+You can automatically link OmniAuth users with existing GitLab users if their email addresses match.
+For example, the following setting is used to enable the auto link feature for both a SAML provider and the Twitter OAuth provider:
 
 **For Omnibus installations**