hidtrigger: Add docstrings
hidtrigger: Add docstrings

DIYBookScanner/spreads,miloh/spreads,adongy/spreads,nafraf/spreads,nafraf/spreads,nafraf/spreads,DIYBookScanner/spreads,adongy/spreads,gareth8118/spreads,gareth8118/spreads,DIYBookScanner/spreads,gareth8118/spreads,adongy/spreads,miloh/spreads,miloh/spreads