Is your feature request related to a problem? Please describe.
Currently our technical documentation for the MycroftSkill class includes very limited documentation for self.file_system:
https://mycroft-core.readthedocs.io/en/master/source/mycroft.html#mycroft.MycroftSkill.file_system

This makes it harder to discover and understand - even knowing it's there I struggle to find it sometimes.

Describe the solution you'd like
The docstrings in the Filesystem class actually already exist just need to add these to the export.