Update scanning URLs from edge relnotes (docker#11571)

* Update scanning URLs from edge relnotes

* Add download URLs

Author: usha-mandya

docker-for-mac/edge-release-notes.md

@@ -14,9 +14,11 @@ For information about Stable releases, see the [Stable release notes](release-no
 ## Docker Desktop Community 2.4.2.0
 2020-10-19
 
+> [Download](https://desktop.docker.com/mac/edge/48975/Docker.dmg)
+
 ### New
 
-- If you have enabled [Vulnerability Scanning](https://docs.docker.com/docker-hub/vulnerability-scanning/) in Docker Hub, the scan results will now appear in Docker Desktop.
+- If you have enabled [Vulnerability Scanning](/docker-hub/vulnerability-scanning/) in Docker Hub, the scan results will now appear in Docker Desktop.
 
 ### Upgrades
 

docker-for-windows/edge-release-notes.md

@@ -14,9 +14,11 @@ For information about Stable releases, see the [Stable release notes](release-no
 ## Docker Desktop Community 2.4.2.0
 2020-10-19
 
+> [Download](https://desktop.docker.com/win/edge/48975/Docker%20Desktop%20Installer.exe)
+
 ### New
 
-- If you have enabled [Vulnerability Scanning](https://docs.docker.com/docker-hub/vulnerability-scanning/) in Docker Hub, the scan results will now appear in Docker Desktop.
+- If you have enabled [Vulnerability Scanning](/docker-hub/vulnerability-scanning/) in Docker Hub, the scan results will now appear in Docker Desktop.
 
 ### Upgrades