RH 7.8

-------
cc: @DCtheGeek

Author: mgreenegit

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

@@ -68,7 +68,7 @@ The following table shows a list of supported operating system on Azure images:
 |Microsoft|Windows Server|2012 Datacenter, 2012 R2 Datacenter, 2016 Datacenter, 2019 Datacenter|
 |Microsoft|Windows Client|Windows 10|
 |OpenLogic|CentOS|7.3, 7.4, 7.5, 7.6, 7.7|
-|Red Hat|Red Hat Enterprise Linux|7.4, 7.5, 7.6, 7.7|
+|Red Hat|Red Hat Enterprise Linux|7.4, 7.5, 7.6, 7.7, 7.8|
 |Suse|SLES|12 SP3|
 
 ### Unsupported client types