Extend doc fragment from base constructed class to fix error

[AlanCoding]

SUMMARY

This resolves an error I get about an undefined option, and it follows the pattern from other inventory plugins, like aws_ec2

ISSUE TYPE

• Bugfix Pull Request

COMPONENT NAME

plugins/inventory/azure_rm.py

ADDITIONAL INFORMATION

this is the error before the patch:

[WARNING]:  * Failed to parse /home/alancoding/repos/awx/testing/awx_75_ug7azj7k/azure_rm.yml with auto plugin: 'Requested
entry (plugin_type: inventory plugin: ansible_collections.azure.azcollection.plugins.inventory.azure_rm setting:
leading_separator ) was not defined in configuration.'
  File "/home/alancoding/repos/ansible/lib/ansible/inventory/manager.py", line 290, in parse_source
    plugin.parse(self._inventory, self._loader, source, cache=cache)
  File "/home/alancoding/repos/ansible/lib/ansible/plugins/inventory/auto.py", line 58, in parse
    plugin.parse(inventory, loader, path, cache=cache)
  File "/home/alancoding/.ansible/collections/ansible_collections/azure/azcollection/plugins/inventory/azure_rm.py", line 206, in parse
    self._get_hosts()
  File "/home/alancoding/.ansible/collections/ansible_collections/azure/azcollection/plugins/inventory/azure_rm.py", line 290, in _get_hosts
    self._add_host_to_keyed_groups(constructable_config_keyed_groups, h.hostvars, inventory_hostname, strict=constructable_config_strict)
  File "/home/alancoding/repos/ansible/lib/ansible/plugins/inventory/__init__.py", line 446, in _add_host_to_keyed_groups
    if prefix == '' and self.get_option('leading_separator') is False:
  File "/home/alancoding/repos/ansible/lib/ansible/plugins/__init__.py", line 60, in get_option
    raise KeyError(to_native(e))

Then with the patch it successfully completes.

[azure-pipelines]

There was an error handling pipeline event 42ca79ef-f80f-4521-b1f7-316c5bb63c1f.