add note about SQL Analytics endpoints (#4523)

## What are you changing in this pull request and why?
in Fabric there are SQL analytics endpoint and there are Warehouses
SQL analytics endpoints are read-only, we can connect to them, we can
even create views but we can't create tables
so for that, you use a Warehouse
Confusingly the URL you connect to is exactly the same, you just swap
the name of your endpoint for the name of your warehouse. And to make it
more interesting, you can access everything your endpoint has, through a
Warehouse.


https://learn.microsoft.com/en-us/fabric/data-warehouse/data-warehousing#compare-the-warehouse-and-the-sql-analytics-endpoint-of-the-lakehouse
## Checklist

- [x] Review the [Content style
guide](https://github.com/dbt-labs/docs.getdbt.com/blob/current/contributing/content-style-guide.md)
so my content adheres to these guidelines.

website/docs/docs/core/connect-data-platform/fabric-setup.md

@@ -39,12 +39,15 @@ If you already have ODBC Driver 17 installed, then that one will work as well.
 
 #### Supported configurations
 
-* The adapter is tested with Microsoft Fabric Synapse Data Warehouse.
+* The adapter is tested with Microsoft Fabric Synapse Data Warehouses (also referred to as Warehouses).
 * We test all combinations with Microsoft ODBC Driver 17 and Microsoft ODBC Driver 18.
 * The collations we run our tests on are `Latin1_General_100_BIN2_UTF8`.
 
 The adapter support is not limited to the matrix of the above configurations. If you notice an issue with any other configuration, let us know by opening an issue on [GitHub](https://github.com/microsoft/dbt-fabric).
 
+##### Unsupported configurations
+SQL analytics endpoints are read-only and so are not appropriate for Transformation workloads, use a Warehouse instead.
+
 ## Authentication methods & profile configuration
 
 ### Common configuration