OCPBUGS-34175:adding new region

Author: Brendan Daly

modules/installation-azure-regions.adoc

@@ -34,6 +34,7 @@ The installation program dynamically generates the list of available Microsoft A
 * `japanwest` (Japan West)
 * `koreacentral` (Korea Central)
 * `koreasouth` (Korea South)
+* `mexicocentral` (Mexico Central)
 * `northcentralus` (North Central US)
 * `northeurope` (North Europe)
 * `norwayeast` (Norway East)