Update disks-premv2-regions.md

Changing Availability Zone from Three to One. Fixing the typo

Author: vishalprayag24

includes/disks-premv2-regions.md

@@ -29,6 +29,6 @@ Currently only available in the following regions:
 - West US 2 (Three availability zones)
 - West US 3 (Three availability zones)
 - Australia East (Three availability zones)
-- France Central (Three availability zones)
+- France Central (One availability zone)
 - Norway East (One availability zone)
 - UAE North (Three availability zones)