Merged PR 12043: Update placeholder text, rename feature file

Not sure I will be able to publish 'rip and replace' content this week, so updating the incorrectly published pages for now with generic placeholder text.

windows/deployment/windows-autopilot/existing-devices.md

@@ -1,5 +1,5 @@
 ---
-title: Rip and Replace
+title: Autopilot for existing devices
 description: Listing of Autopilot scenarios
 keywords: mdm, setup, windows, windows 10, oobe, manage, deploy, autopilot, ztd, zero-touch, partner, msfb, intune
 ms.prod: w10
@@ -9,11 +9,11 @@ ms.sitesec: library
 ms.pagetype: deploy
 author: greg-lindsay
 ms.author: greglin
-ms.date: 06/01/2018
+ms.date: 10/11/2018
 ---
 
-# Rip and replace
+# Autopilot for existing devices
 
 **Applies to: Windows 10**
 
-DO NOT PUBLISH.  Just a placeholder for now, coming with 1809.
+Placeholder. Content coming.

windows/deployment/windows-autopilot/user-driven-aad.md

@@ -9,11 +9,11 @@ ms.sitesec: library
 ms.pagetype: deploy
 author: greg-lindsay
 ms.author: greglin
-ms.date: 06/01/2018
+ms.date: 10/11/2018
 ---
 
 # Windows Autopilot user-driven mode for Azure Active Directory
 
 **Applies to: Windows 10**
 
-DO NOT PUBLISH.  This eventually will contain the AAD-specific instuctions currently in user-driven.md.
+Placeholder. Content coming.

windows/deployment/windows-autopilot/user-driven-hybrid.md

@@ -9,7 +9,7 @@ ms.sitesec: library
 ms.pagetype: deploy
 author: greg-lindsay
 ms.author: greglin
-ms.date: 06/01/2018
+ms.date: 10/11/2018
 ---
 
 
@@ -17,4 +17,4 @@ ms.date: 06/01/2018
 
 **Applies to: Windows 10**
 
-DO NOT PUBLISH.  This eventually will contain the AD-specific (hybrid) instuctions.  This will be in preview at a later point in time.
+Placeholder. Content coming.