Add change log for Az.Functions and Az.ResourceMover (#16693)

Author: msJinLei

src/Functions/ChangeLog.md

@@ -18,6 +18,7 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Removed preview from the PowerShell 7.0 stack on Linux
 
 ## Version 4.0.0
 * [Breaking change] `Update-AzFunctionAppPlan` prompts for confirmation [#16490]

src/ResourceMover/Changelog.md

@@ -18,6 +18,9 @@
         - Additional information about change #1
 -->
 ## Upcoming Release
+* Added support for Tags in azure resource mover
+* Added support for SystemData in azure resource mover
+* Released 2021-08-01 api-version
 
 ## Version 1.0.0
 * General availability of 'Az.ResourceMover' module