Removing old in preview messages

Author: VesaJuvonen

docs/features/hub-site/REST-unregisterhubsite-method.md

@@ -7,9 +7,6 @@ ms.localizationpriority: medium
 
 # UnRegisterHubSite
 
-> [!IMPORTANT]
-> The hub sites feature is currently in preview and is subject to change. It is not currently supported for use in production environments.
-
 Unregisters a hub site so that it is no longer a hub site. It will become a regular site. Any sites associated with the hub site will no longer be associated. This can take up to an hour to propagate. If you want to speed up the process, first remove any associated sites before unregistering the hub site. 
 
 ## HTTP request

docs/spfx/toolchain/implement-ci-cd-with-azure-devops.md

@@ -16,7 +16,7 @@ This article explains the steps involved in setting up your Azure DevOps environ
 
 There are currently two approaches available to implement continuous integration, and deployment in Azure DevOps.  
 Azure builds and releases is the historic one, featuring a graphical edition experience and storing the definitions in a JSON document hidden from the user.  
-Azure multi-stage Pipelines is a newer feature still in preview, is relies on pipeline definitions stored as YAML files on the repository providing transparency, version history and repeatability.  
+
 Both approaches are described for the SharePoint Framework:
 
 - Azure Build and Release (this article)