DOC-13103: Non-KV nodes in server bootstrap connstr (#870)

Author: simon-dew

modules/ROOT/pages/configuration-schema-bootstrap.adoc

@@ -32,11 +32,13 @@ See the <<lbl-schema, schema>> below for more details on these properties.
 
 Use the following command to run Sync Gateway with a configuration file:
 
-[source, bashrc]
+[source, bash]
 ----
 sync_gateway sync-gateway-bootstrap.json
 ----
 
+NOTE: For reliable operation, all the nodes listed in the xref:bootstrap-server[`bootstrap.server`] connection string must be data (KV) nodes.
+
 [#lbl-schema]
 == Bootstrap Configuration Schema