BEERS Temperature documentation

[MatthewPaskin]

Describe the bug
In the BEERS module documentation of df_output_variables, Tg is labelled as "Surface temperature". Is this the case or is this actually the ground temperature?

Also Tw is missing from the documentation of df_output_variables but is available in the BEERS output file

Location
https://suews.readthedocs.io/en/latest/related-softwares/supy/data-structure/df_state.html

Looking at the code it seems Tw should be the Transfer coefficient of water

[suegrimmond]

so need labels to be more complete
surface temperature for ground
surface temperatture of wall - with some comment about orientation