Remove the preview terminology for GitHub actions

Author: ahmedelnably

articles/azure-functions/functions-how-to-github-actions.md

@@ -13,9 +13,6 @@ ms.author: aelnably
 
 [GitHub Actions](https://github.com/features/actions) lets you define a workflow to automatically build and deploy your functions code to function app in Azure. 
 
-> [!IMPORTANT]  
-> GitHub Actions is currently in beta. You must first [sign-up to join the preview](https://github.com/features/actions) using your GitHub account.
-
 In GitHub Actions, a [workflow](https://help.github.com/articles/about-github-actions#workflow) is an automated process that you define in your GitHub repository. This process tells GitHub how to build and deploy your functions app project on GitHub. 
 
 A workflow is defined by a YAML (.yml) file in the `/.github/workflows/` path in your repository. This definition contains the various steps and parameters that make up the workflow.