Unclickable attributes in session classes

[seanpearsonuk]

e.g., in Meshing, all attributes are unclickable. Presumably, it is because we need to document the types in the code so that the type is clickable. Let's experiment with that. This is a general issue that we could try to solve in the same way. It's very important - otherwise we cannot show how the code fits together. Similar issue for arguments. Note how launch_fluent's arguments are fully documented due to the docstring in the code.

[hpohekar]

@seanpearsonuk Yes we can use autodocsumm to resolve this issue.