Consider true/false in docs for boolean

[Nemental]

Replace yes/no with true/false in docs.
fixes #202

[Nemental]

I'm unsure about the column Required in
https://github.com/T-Systems-MMS/ansible-collection-icinga-director/blob/master/roles/ansible_icinga/README.md

[rndmh3ro]

Thanks for your PR. Unfortunately the documentation gets automatically created automatically from the DOCUMENTATION and EXAMPLES in the plugins, e.g. this: https://github.com/T-Systems-MMS/ansible-collection-icinga-director/blob/master/plugins/modules/icinga_command.py#L66

So you'd need to change all files in the plugins-folder and in the inventory-plugin: https://github.com/T-Systems-MMS/ansible-collection-icinga-director/blob/master/plugins/inventory/icinga_director_inventory.py

You then have to run the update-script manually (https://github.com/T-Systems-MMS/ansible-collection-icinga-director/blob/master/CONTRIBUTING.md#updating-the-tests-and-examples) but I can also do this afterwards.

Do you want tackle this?

I'm unsure about the column Required in

We can keep this as it is.

[rndmh3ro]

Thank you!