Update disks-premv2-regions.md

France central - third AZ got live. Updated the doc

Author: vishalprayag24

includes/disks-premv2-regions.md

@@ -18,7 +18,7 @@ Currently only available in the following regions:
 - China North 3 (Three availability zones)
 - North Europe (Three availability zones)
 - West Europe (Three availability zones)
-- France Central (Two availability zones)
+- France Central (Three availability zones)
 - Central India (Three availability zones)
 - Japan East (Two availability zones)
 - Korea Central (Two availability zones)