docs: add required permissions for non-admin users to B/G plugin docs (#1559)

Author: aaron-congo

docs/using-the-jdbc-driver/using-plugins/UsingTheBlueGreenPlugin.md

@@ -18,6 +18,7 @@ The AWS JDBC Driver leverages the Blue/Green Deployment approach by intelligentl
 >
 > Additional Requirements:
 > - AWS cluster and instance endpoints must be directly accessible from the client side
+> - :warning: If connecting with non-admin users, permissions must be granted to the users so that the blue/green metadata table/function can be properly queried. If the permissions are not granted, the metadata table/function will not be visible and blue/green plugin functionality will not work properly. Please see the [Connecting with non-admin users](#connecting-with-non-admin-users) section below.
 > - Connecting to database nodes using CNAME aliases is not supported
 >
 > **Blue/Green Support Behaviour and Version Compatibility:**
@@ -90,6 +91,16 @@ properties.setProperty("blue-green-monitoring-socketTimeout", "10000");
 > **Always ensure you provide a non-zero socket timeout value or a connect timeout value to the Blue/Green Deployment Plugin**
 >
 
+## Connecting with non-admin users
+> [!WARNING]\
+> If connecting with non-admin users, permissions must be granted to the users so that the blue/green metadata table/function can be properly queried. If the permissions are not granted, the metadata table/function will not be visible and blue/green plugin functionality will not work properly.
+
+| Environment       | Required permission statements                                                                                        |
+|-------------------|-----------------------------------------------------------------------------------------------------------------------|
+| Aurora Postgresql | None                                                                                                                  |
+| RDS Postgresql    | `GRANT USAGE ON SCHEMA rds_tools TO your_user;`<br>`GRANT EXECUTE ON ALL FUNCTIONS IN SCHEMA rds_tools TO your_user;` |
+| Aurora MySQL      | `GRANT SELECT ON mysql.rds_topology TO 'your_user'@'%';`<br>`FLUSH PRIVILEGES;`                                       |
+| RDS MySQL         | `GRANT SELECT ON mysql.rds_topology TO 'your_user'@'%';`<br>`FLUSH PRIVILEGES;`                                       |
 
 ## Plan your Blue/Green switchover in advance