Remarks on the modules development tutorial page

[c8y3]

These remarks are all about the documentation page Processor modules, with respect to a v2.0.0-beta-1 version:

• listing iris_dummy_module/IrisDummyConfig.py: module_version should be a string, rather than a float
• likewise, it would be nice for the attribute _interface_version to have a string, rather than float type
• listing iris_dummy_module/IrisDummyModule.py: the import which defines interface_conf is probably missing?
• listing iris_dummy_module/IrisDummyModule.py, method hooks_handler has the wrong signature: it is missing the hook_ui_name.

Thank you.