Reflect branding/nav and promote extract List (SharePoint#4093)

Author: melitoSP

docs/declarative-customization/site-design-overview.md

@@ -54,10 +54,6 @@ When the scripts are complete the notification bar message will change - allowin
 
 The site design information panel can be invoked by a site owner at any time to see what site designs have been applied to the site (and their script details) as well as to apply new or updated site designs. 
 
-
-> [!NOTE]
-> The site design information panel started rolling out to Target Release customers in December 2018 - and will complete WW rollout in early 2019.
-
 When the actions in the scripts are completed, SharePoint displays detailed results of those actions in a progress pane.
 
 ![Site Design Information Panel](images/site-design-information-panel-applied-site-designs.png)
@@ -130,9 +126,10 @@ Available actions include:
 
 - Creating a new list or library (or modifying the default one created with the site)
 - Creating site columns, content types, and configuring other list settings
+- Set site branding properties like navigation layout, header layout and header background
 - Applying a theme
 - Setting a site logo
-- Adding navigation
+- Adding links to quick launch or hub navigation
 - Triggering a Microsoft Flow
 - Installing a deployed solution from the app catalog
 - Setting regional settings for the site
@@ -141,6 +138,9 @@ Available actions include:
 
 For a complete list of available actions and their parameters, see the [JSON schema](https://docs.microsoft.com/en-us/sharepoint/dev/declarative-customization/site-design-json-schema).
 
+> [!NOTE]
+> For libraries and lists, use the PowerShell command [Get-SPOSiteScriptFromList](https://docs.microsoft.com/en-us/powershell/module/sharepoint-online/Get-SPOSiteScriptFromList?view=sharepoint-ps) to create the site script syntax from an existing SharePoint list. 
+
 Site scripts can be run again on the same site after provisioning. Site scripts are non-destructive, so when they run again, they ensure that the site matches the configuration in the script. 
 
 For example, if the site already has a list with the same name that the site script is creating, the site script will only add missing fields to the existing list.