Add X to CommonOAuth2Provider Reference

Issue gh-16510

Signed-off-by: Rob Winch <362503+rwinch@users.noreply.github.com>

docs/modules/ROOT/pages/reactive/oauth2/login/core.adoc

@@ -153,7 +153,7 @@ A `ClientRegistration` can be initially configured using discovery of an OpenID
 [[webflux-oauth2-login-common-oauth2-provider]]
 == CommonOAuth2Provider
 
-`CommonOAuth2Provider` pre-defines a set of default client properties for a number of well known providers: Google, GitHub, Facebook, and Okta.
+`CommonOAuth2Provider` pre-defines a set of default client properties for a number of well known providers: Google, GitHub, Facebook, X, and Okta.
 
 For example, the `authorization-uri`, `token-uri`, and `user-info-uri` do not change often for a Provider.
 Therefore, it makes sense to provide default values in order to reduce the required configuration.

docs/modules/ROOT/pages/servlet/oauth2/login/core.adoc

@@ -153,7 +153,7 @@ You can initially configure a `ClientRegistration` by using discovery of an Open
 [[oauth2login-common-oauth2-provider]]
 == CommonOAuth2Provider
 
-`CommonOAuth2Provider` pre-defines a set of default client properties for a number of well known providers: Google, GitHub, Facebook, and Okta.
+`CommonOAuth2Provider` pre-defines a set of default client properties for a number of well known providers: Google, GitHub, Facebook, X, and Okta.
 
 For example, the `authorization-uri`, `token-uri`, and `user-info-uri` do not change often for a provider.
 Therefore, it makes sense to provide default values, to reduce the required configuration.