Addressing comments

Author: davidcho23

src/azure-cli/azure/cli/command_modules/resource/_params.py

@@ -535,7 +535,7 @@ def load_arguments(self, _):
         c.argument('skip_resource_name_params', action='store_true')
         c.argument('skip_all_params', action='store_true')
         c.argument('resource_ids', nargs='+', options_list='--resource-ids')
-        c.argument('export_format', options_list=['--export-format'], help="The format of the exported template. Allowed values: 'json', 'arm', 'bicep'. Defaults to 'json'.")
+        c.argument('export_format', help="The format of the exported template. Allowed values: 'json', 'arm', 'bicep'. Defaults to 'json'.")
 
     with self.argument_context('group create') as c:
         c.argument('rg_name', options_list=['--name', '--resource-group', '-n', '-g'],

src/azure-cli/azure/cli/command_modules/resource/custom.py

@@ -1691,7 +1691,7 @@ def export_group_as_template(
     elif export_format.lower() == "bicep":
         export_template_request = ExportTemplateRequest(resources=resources, options=options, output_format="Bicep")
     else:
-        raise CLIError('az resource: error: argument --export-format: invalid ExportFormat value: \'%s\'' % export_format)
+        raise InvalidArgumentValueError('az resource: error: argument --export-format: invalid ExportFormat value: \'%s\'' % export_format)
 
     # Exporting a resource group as a template is async since API version 2019-08-01.
     if cmd.supported_api_version(min_api='2019-08-01'):