Fix doc linting and cut-and-paste build failure

app/helpers/auth_helper.rb

@@ -36,7 +36,7 @@ module AuthHelper
   end
 
   def icon_for_provider(name)
-    Gitlab::OAuth::Provider.icon_for(name)
+    Gitlab::Auth::OAuth::Provider.icon_for(name)
   end
 
   def form_based_provider_priority

doc/administration/auth/oidc.md

@@ -84,7 +84,7 @@ The OpenID Connect will provide you with a client details and secret for you to
 
 1. For the configuration above, change the values for the provider to match your OpenID Connect client setup. Use the following as a guide:
    - `<your_oidc_label>` is the label that will be displayed on the login page.
-   - `<url_to_custom_provider_icon>` (optional) is the icon that will be displayed on the login page. Icons for the major social login platforms are built-in into Gitlab,
+   - `<url_to_custom_provider_icon>` (optional) is the icon that will be displayed on the login page. Icons for the major social login platforms are built-in into GitLab,
      but can be overridden by specifying this parameter.
    - `<your_oidc_url>` (optional) is the URL that points to the OpenID Connect provider. For example, `https://example.com/auth/realms/your-realm`.
      If this value is not provided, the URL is constructed from the `client_options` in the following format: `<client_options.scheme>://<client_options.host>:<client_options.port>`.