Update mac-create-ssh-keys.md

Missing comma.

Author: nachoalonsoportillo

articles/virtual-machines/linux/mac-create-ssh-keys.md

@@ -81,7 +81,7 @@ az vm create \
   --ssh-key-values mysshkey.pub
 ```
 
-If you want to use multiple SSH keys with your VM, you can enter them in a space-separated list, like this `--ssh-key-values sshkey-desktop.pub sshkey-laptop.pub`.
+If you want to use multiple SSH keys with your VM, you can enter them in a space-separated list, like this `--ssh-key-values sshkey-desktop.pub, sshkey-laptop.pub`.
 
 
 ## SSH into your VM