Update PowerShell reference README (#12636)

* Update PowerShell reference README

* Update reference/README.md

---------

Co-authored-by: Sean Wheeler <sean.wheeler@microsoft.com>

Author: surfingoldelephant

reference/README.md

@@ -1,18 +1,17 @@
 ---
 locale: en-us
-ms.date: 05/18/2022
+ms.date: 01/02/2026
 schema: 2.0.0
 title: README
 ---
 # PowerShell Reference
 
 Reference material is organized into release versions. The content for each
-version is organized by module name, and a distinct folder for the about
-topics.
+version is organized by module name. `about_*` articles are in an `About` folder under the module folder they are related to. Most of them are under `Microsoft.PowerShell.Core/About`.
 
-Over time, namespaces appeared as:
+## Modules
 
-|         Module Name / PS Version          |  5.1  |  7.2  |  7.4  |  7.5  |
+|         Module Name / PS Version          |  5.1  |  7.4  |  7.5  |  7.6  |
 | ----------------------------------------- | :---: | :---: | :---: | :---: |
 | CimCmdlets                                |   X   |   X   |   X   |   X   |
 | ISE (introduced in 2.0)                   |   X   |       |       |       |
@@ -26,13 +25,20 @@ Over time, namespaces appeared as:
 | Microsoft.PowerShell.Operation.Validation |   X   |       |       |       |
 | Microsoft.PowerShell.Security             |   X   |   X   |   X   |   X   |
 | Microsoft.PowerShell.Utility              |   X   |   X   |   X   |   X   |
-| Microsoft.WsMan.Management                |   X   |   X   |   X   |   X   |
-| PackageManagement                         |   X   |   X   |   X   |   X   |
-| PowershellGet                             |   X   |   X   |   X   |   X   |
-| PSDesiredStateConfiguration               |   X   |   X   |       |       |
+| Microsoft.WSMan.Management                |   X   |   X   |   X   |   X   |
+| PackageManagement                         |       |       |       |       |
+| PowershellGet                             |       |       |       |       |
+| PSDesiredStateConfiguration               |       |       |       |       |
 | PSDiagnostics                             |   X   |   X   |   X   |   X   |
 | PSReadLine                                |   X   |   X   |   X   |   X   |
 | PSScheduledJob                            |   X   |       |       |       |
 | PSWorkflow                                |   X   |       |       |       |
 | PSWorkflowUtility                         |   X   |       |       |       |
 | ThreadJob                                 |       |   X   |   X   |   X   |
+
+## History
+
+- `PackageManagement` and `PowershellGet` content moved to the
+`PowerShell-Docs-PSGet` repository.
+- `PSDesiredStateConfiguration` content moved to the `PowerShell-Docs-DSC`
+repository with the release of PowerShell DSC 2.0.