Add OS support statement

ee/desktop/admin/install/mac.md

@@ -18,6 +18,8 @@ This page contains information about the system requirements and specific instru
 
 - VirtualBox prior to version 4.3.30 must NOT be installed (it is incompatible with Docker for Mac). If you have a newer version of VirtualBox installed, it’s fine.
 
+> **Note:** Docker supports Docker Desktop Enterprise on the most recent versions of macOS. That is, the current release of macOS and the previous two releases. As new major versions of macOS are made generally available, Docker will stop supporting the oldest version and support the newest version of macOS (in addition to the previous two releases).
+
 # Installation
 
 Download Docker Desktop Enterprise for [**Mac**](https://download.docker.com/mac/enterprise/Docker.pkg). The DDE installer includes Docker Engine, Docker CLI client, and Docker Compose.

ee/desktop/admin/install/windows.md

@@ -26,6 +26,8 @@ Hyper-V on Windows 10:
 
 ![Virtualization Technology (VTx) must be enabled in BIOS settings](../../images/windows-prereq.png "BIOS setting information for hardware virtualization support")
 
+> **Note:** Docker supports Docker Desktop Enterprise on Windows based on Microsoft’s support lifecycle for Windows 10 operating system. For more information, see the [Windows lifecycle fact sheet](https://support.microsoft.com/en-us/help/13853/windows-lifecycle-fact-sheet).
+
 # Installation
 
 Download Docker Desktop Enterprise for [**Windows**](https://download.docker.com/win/enterprise/DockerDesktop.msi).

ee/desktop/user/windows-user.md

@@ -436,7 +436,7 @@ The **Version Selection** option lists the version packs installed on your Docke
 
 To switch to a different version pack, simply click on the version pack you would like to use.
 
-![Version Selection](../images/win-ver-select.png)
+![Version Selection](../images/win-ver-select.PNG)
 
 ## Diagnose and Feedback