Update list.py

updated the fstring

Author: ramkishor-ch

SoftLayer/CLI/file/list.py

@@ -63,7 +63,7 @@
 @click.option('--sortby', help='Column to sort by', default='username')
 @click.option('--columns',
               callback=column_helper.get_formatter(COLUMNS),
-              help=f"Columns to display. Options: { ', '.join(column.name for column in COLUMNS)}",
+              help=f"Columns to display. Options: {', '.join(column.name for column in COLUMNS)}",
               default=','.join(DEFAULT_COLUMNS))
 @environment.pass_env
 def cli(env, sortby, columns, datacenter, username, storage_type, order):