Remove UC banner warning, fix UC tables help (#504)

* Remove UC banner warning, fix UC tables help

* Tweak tables banner message.

Author: adamcain-db

databricks_cli/unity_catalog/cli.py

@@ -37,11 +37,7 @@
 from databricks_cli.unity_catalog.lineage_cli import register_lineage_commands
 
 
-@click.group(context_settings=CONTEXT_SETTINGS,
-             help='Utility to interact with Databricks Unity Catalog.\n\n' +
-             '**********************************************************************\n' +
-             'WARNING: these commands are EXPERIMENTAL and not officially supported.\n' +
-             '**********************************************************************')
+@click.group(context_settings=CONTEXT_SETTINGS)
 @click.option('--version', '-v', is_flag=True, callback=print_version_callback,
               expose_value=False, is_eager=True, help=version)
 def unity_catalog_group():  # pragma: no cover

databricks_cli/unity_catalog/table_cli.py

@@ -150,12 +150,12 @@ def delete_table_cli(api_client, full_name):
     UnityCatalogApi(api_client).delete_table(full_name)
 
 
-@click.group()
+@click.group(context_settings=CONTEXT_SETTINGS,
+             short_help=' ',
+             help='Note:\n' +
+                  'To create or update tables, use SQL commands\n' +
+                  '(CREATE TABLE or ALTER TABLE) on a cluster or SQL warehouse.')
 def tables_group():  # pragma: no cover
-    """
-    Note: To create or update tables, please run the appropriate SQL commands
-    on a cluster or endpoint (CREATE TABLE and ALTER TABLE).
-    """
     pass