Merge pull request #220246 from mattchenderson/idptable

updating idp table

Author: prmerger-automator[bot]

articles/app-service/overview-authentication-authorization.md

@@ -31,6 +31,8 @@ App Service uses [federated identity](https://en.wikipedia.org/wiki/Federated_id
 | [Facebook](https://developers.facebook.com/docs/facebook-login) | `/.auth/login/facebook` | [App Service Facebook login](configure-authentication-provider-facebook.md) |
 | [Google](https://developers.google.com/identity/choose-auth) | `/.auth/login/google` | [App Service Google login](configure-authentication-provider-google.md) |
 | [Twitter](https://developer.twitter.com/en/docs/basics/authentication) | `/.auth/login/twitter` | [App Service Twitter login](configure-authentication-provider-twitter.md) |
+| [GitHub](https://docs.github.com/en/developers/apps/building-oauth-apps/creating-an-oauth-app) | `/.auth/login/github` | [App Service GitHub login](configure-authentication-provider-github.md) |
+| [Sign in with Apple](https://developer.apple.com/sign-in-with-apple/) | `/.auth/login/apple` | [App Service Sign in With Apple login (Preview)](configure-authentication-provider-apple.md) |
 | Any [OpenID Connect](https://openid.net/connect/) provider | `/.auth/login/<providerName>` | [App Service OpenID Connect login](configure-authentication-provider-openid-connect.md) |
 
 When you enable authentication and authorization with one of these providers, its sign-in endpoint is available for user authentication and for validation of authentication tokens from the provider. You can provide your users with any number of these sign-in options.