Update docs (#383)

Author: joaopalet

docs/stackit_beta_sqlserverflex_options.md

@@ -15,13 +15,16 @@ stackit beta sqlserverflex options [flags]
 
 ```
   List SQL Server Flex flavors options
-  $ stackit sqlserverflex options --flavors
+  $ stackit beta sqlserverflex options --flavors
 
   List SQL Server Flex available versions
-  $ stackit sqlserverflex options --versions
+  $ stackit beta sqlserverflex options --versions
 
   List SQL Server Flex storage options for a given flavor. The flavor ID can be retrieved by running "$ stackit sqlserverflex options --flavors"
-  $ stackit sqlserverflex options --storages --flavor-id <FLAVOR_ID>
+  $ stackit beta sqlserverflex options --storages --flavor-id <FLAVOR_ID>
+
+  List SQL Server Flex user roles and database compatibilities for a given instance. The IDs of existing instances can be obtained by running "$ stackit sqlserverflex instance list"
+  $ stackit beta sqlserverflex options --user-roles --db-compatibilities --instance-id <INSTANCE_ID>
 ```
 
 ### Options