update sso callout for SL (#4357)

pr clarifies SL doens't support SSO and SSH postgres/redshift in the
cloud cli [per slack
thread](https://dbt-labs.slack.com/archives/C047UU1H7R9/p1698359572179419)

website/snippets/_v2-sl-prerequisites.md

@@ -8,7 +8,8 @@
    - **Note:** Semantic Layer currently supports the Deployment environment for querying. (_development querying experience coming soon_) 
 - Set up the [Semantic Layer API](/docs/dbt-cloud-apis/sl-api-overview) in the integrated tool to import metric definitions. 
   - To access the API and query metrics in downstream tools, you must have a dbt Cloud [Team or Enterprise](https://www.getdbt.com/pricing/) account. dbt Core or Developer accounts can define metrics but won't be able to dynamically query them.<br />
-- Understand [MetricFlow's](/docs/build/about-metricflow) key concepts, which powers the latest dbt Semantic Layer. 
+- Understand [MetricFlow's](/docs/build/about-metricflow) key concepts, which powers the latest dbt Semantic Layer.  
+- Note that SSH tunneling for [Postgres and Redshift](/docs/cloud/connect-data-platform/connect-redshift-postgresql-alloydb) connections, [PrivateLink](/docs/cloud/secure/about-privatelink), and [Single sign-on (SSO)](/docs/cloud/manage-access/sso-overview) isn't supported yet.
 
 </VersionBlock>