Update example docs for SET SESSION

Specifically change to an example from the Iceberg connector, since
current example with the Accumulo connector is no longer valid when
that connector is removed.

docs/src/main/sphinx/sql/set-session.md

@@ -40,20 +40,22 @@ lost.
 The following example sets a system session property to enable optimized hash
 generation:
 
-```
+```sql
 SET SESSION optimize_hash_generation = true;
 ```
 
-The following example sets the `optimize_locality_enabled` catalog session
-property for an Accumulo catalog named `acc01`:
+The following example sets the `incremental_refresh_enabled` catalog session
+property for a catalog using the [](/connector/iceberg) named `example`:
 
-```
-SET SESSION acc01.optimize_locality_enabled = false;
+```sql
+SET SESSION example.incremental_refresh_enabled=false;
 ```
 
-The example `acc01.optimize_locality_enabled` catalog session property
-does not apply to any other catalog, even if another catalog also uses the
-Accumulo connector.
+The related catalog configuration property `iceberg.incremental-refresh-enabled`
+defaults to `true`, and the session property allows you to override this setting
+in for specific catalog and the current session. The
+`example.incremental_refresh_enabled` catalog session property does not apply to
+any other catalog, even if another catalog also uses the Iceberg connector.
 
 ## See also