OSDOCS-3834: Adding ap-southeast-3 to support AWS regions

Author: mjpytlak

modules/installation-aws-regions.adoc

@@ -25,6 +25,7 @@ The following AWS public regions are supported:
 * `ap-south-1` (Mumbai)
 * `ap-southeast-1` (Singapore)
 * `ap-southeast-2` (Sydney)
+* `ap-southeast-3` (Jakarta)
 * `ca-central-1` (Central)
 * `eu-central-1` (Frankfurt)
 * `eu-north-1` (Stockholm)