OSDOCS-3558: Addded asia-south2 to supported GCP regions

Author: mjpytlak

modules/installation-gcp-regions.adoc

@@ -16,6 +16,7 @@ regions:
 * `asia-northeast2` (Osaka, Japan)
 * `asia-northeast3` (Seoul, South Korea)
 * `asia-south1` (Mumbai, India)
+* `asia-south2` (Delhi, India)
 * `asia-southeast1` (Jurong West, Singapore)
 * `asia-southeast2` (Jakarta, Indonesia)
 * `australia-southeast1` (Sydney, Australia)