Add comments for input calibration by provider.
Add comments for input calibration by provider.

inclement/kivy,kivy/kivy,akshayaurora/kivy,matham/kivy,kivy/kivy,matham/kivy,inclement/kivy,matham/kivy,inclement/kivy,matham/kivy,kivy/kivy,akshayaurora/kivy,akshayaurora/kivy,rnixx/kivy,rnixx/kivy,rnixx/kivy