Merge pull request #4889 from EnterpriseDB/docs/postgis_for_big_anima…

…l_UPM-24096

Edits needed for PostGis addition

product_docs/docs/biganimal/release/using_cluster/extensions.mdx

@@ -42,6 +42,7 @@ PostgreSQL contrib extensions/modules:
 - pglogical3 (PostgreSQL v12 and v13 only)
 - pgrowlocks
 - pgstattupple
+- postgis
 - postgres_fdw
 - seg (PostgreSQL v12 only)
 - sslinfo
@@ -69,7 +70,7 @@ EDB extensions:
 
 ## Installing extensions
 
-Use the [`CREATE EXTENSION`](https://www.postgresql.org/docs/current/sql-createextension.html) command to install extensions, except for the EDB Postgres Tuner (pg_tuner) extension. You enable edb_pg_tuner on the **DB Configuration** tab of the Create or Edit Cluster page of the BigAnimal portal.
+Use the [`CREATE EXTENSION`](https://www.postgresql.org/docs/current/sql-createextension.html) command to install most extensions. You must enable certain extensions, including the EDB Postgres Tuner (pg_tuner) extension and PostGIS on the **DB Configuration** tab of the Create or Edit Cluster page of the BigAnimal portal.
 
 
 ### Example: Installing multiple extensions