OCPBUGS#4315 - renaming file to match change in /installer

Author: kalexand-rh

modules/installation-azure-tested-machine-types.adoc

@@ -15,5 +15,5 @@ The following Microsoft Azure instance types have been tested with {product-titl
 .Machine types
 [%collapsible]
 ====
-include::https://raw.githubusercontent.com/openshift/installer/master/docs/user/azure/tested_instance_types.md[]
+include::https://raw.githubusercontent.com/openshift/installer/master/docs/user/azure/tested_instance_types_x86_64.md[]
 ====