Update public docs for IMDS versions

Author: ChhabraAnshul

includes/virtual-machines-imds.md

@@ -254,7 +254,11 @@ When you don't specify a version, you get an error with a list of the newest sup
 - 2021-02-01
 - 2021-03-01
 - 2021-05-01
+- 2021-08-01
 - 2021-10-01
+- 2021-11-01
+- 2021-11-15
+- 2021-12-13
 
 ### Swagger