Remove references to Shibboleth from the documentation

doc/.vale/gitlab/spelling-exceptions.txt

@@ -576,7 +576,6 @@ severities
 sharded
 sharding
 shfmt
-Shibboleth
 Shimo
 Shopify
 Sidekiq

doc/administration/auth/index.md

@@ -31,7 +31,6 @@ providers:
 - [Salesforce](../../integration/salesforce.md)
 - [SAML](../../integration/saml.md)
 - [SAML for GitLab.com groups](../../user/group/saml_sso/index.md) **(PREMIUM SAAS)**
-- [Shibboleth](../../integration/saml.md)
 - [Smartcard](smartcard.md) **(PREMIUM SELF)**
 - [Twitter](../../integration/twitter.md)
 

doc/integration/index.md

@@ -24,8 +24,8 @@ GitLab can be configured to authenticate access requests with the following auth
 - Integrate with [Kerberos](kerberos.md).
 - Enable sign in via [LDAP](../administration/auth/ldap/index.md).
 - Enable [OAuth2 provider](oauth_provider.md) application creation.
-- Use [OmniAuth](omniauth.md) to enable sign in via Twitter, GitHub, GitLab.com, Google,
-  Bitbucket, Facebook, Shibboleth, SAML, Crowd, Azure, or Authentiq ID.
+- Use [OmniAuth](omniauth.md) to enable sign in through Twitter, GitHub, GitLab.com, Google,
+  Bitbucket, Facebook, SAML, Crowd, Azure, or Authentiq ID.
 - Use GitLab as an [OpenID Connect](openid_connect_provider.md) identity provider.
 - Authenticate to [Vault](vault.md) through GitLab OpenID Connect.
 - Configure GitLab as a [SAML](saml.md) 2.0 Service Provider.

doc/integration/omniauth.md

@@ -41,7 +41,6 @@ GitLab supports the following OmniAuth providers.
 | [OpenID Connect](../administration/auth/oidc.md)                    | `openid_connect`           |
 | [Salesforce](salesforce.md)                                         | `salesforce`               |
 | [SAML](saml.md)                                                     | `saml`                     |
-| [Shibboleth](saml.md)                                         | `shibboleth`               |
 | [Twitter](twitter.md)                                               | `twitter`                  |
 
 ## Configure initial settings
@@ -53,7 +52,7 @@ Setting                    | Description | Default value
 ---------------------------|-------------|--------------
 `allow_single_sign_on`     | Enables you to list the providers that automatically create a GitLab account. The provider names are available in the **OmniAuth provider name** column in the [supported providers table](#supported-providers). | The default is `false`. If `false`, users must be created manually, or they can't sign in using OmniAuth.
 `auto_link_ldap_user`      | If enabled, creates an LDAP identity in GitLab for users that are created through an OmniAuth provider. You can enable this setting if you have the [LDAP (ActiveDirectory)](../administration/auth/ldap/index.md) integration enabled. Requires the `uid` of the user to be the same in both LDAP and the OmniAuth provider. | The default is `false`.
-`block_auto_created_users` | If enabled, blocks users that are automatically created from signing in until they are approved by an administrator. | The default is `true`. If you set the value to `false`, make sure you only define providers for `allow_single_sign_on` that you can control, like SAML, Shibboleth, Crowd, or Google. Otherwise, any user on the internet can sign in to GitLab without an administrator's approval.
+`block_auto_created_users` | If enabled, blocks users that are automatically created from signing in until they are approved by an administrator. | The default is `true`. If you set the value to `false`, make sure you only define providers for `allow_single_sign_on` that you can control, like SAML, Crowd, or Google. Otherwise, any user on the internet can sign in to GitLab without an administrator's approval.
 
 To change these settings: