More formatting fixes (hope this works)

Author: Stephen A. Zarkos

articles/virtual-machines/linux/debian-create-upload-vhd.md

@@ -69,6 +69,7 @@ There are tools available for generating Debian VHDs for Azure, such as the [azu
         deb http://debian-archive.trafficmanager.net/debian jessie-backports main
         deb-src http://debian-archive.trafficmanager.net/debian jessie-backports main
 
+
     **Debian 9.x "Stretch"**
         deb http://debian-archive.trafficmanager.net/debian stretch main
         deb-src http://debian-archive.trafficmanager.net/debian stretch main
@@ -79,6 +80,7 @@ There are tools available for generating Debian VHDs for Azure, such as the [azu
         deb http://debian-archive.trafficmanager.net/debian stretch-backports main
         deb-src http://debian-archive.trafficmanager.net/debian stretch-backports main
 
+
 7. Install the Azure Linux Agent:
 
         # sudo apt-get update