Update guest-configuration.md

Author: mgreenegit

articles/governance/policy/concepts/guest-configuration.md

@@ -79,8 +79,6 @@ shows a list of supported operating systems on Azure images:
 |Red Hat|Red Hat Enterprise Linux|7.4 and later|
 |Suse|SLES|12 SP3 and later|
 
-### Custom virtual machine images
-
 Custom virtual machine images are supported by Guest Configuration policies as long as they are one of the operating systems in the table above.
 
 ### Unsupported client types