Learn guide suggest to use lambda function to deal with touchio

[dglaude]

I wanted to use Debouncer with touchio input.

So I went to the learn guide: https://learn.adafruit.com/debouncer-library-python-circuitpython-buttons-sensors/advanced-debouncing

But maybe that part is outdated (I still like to learn about lambda function) because #8 made it more simple to use Debouncer with touchio.

Nothing to fix in the code of this library (except maybe a simpletest_touchio.py that demonstrate that usecase) but the guide could get some update.

[FoamyGuy]

Thanks for the suggestion @dglaude! I will work on updating the learn guide to also show the new simpler way to use the debouncer lib with touchio.

[FoamyGuy]

I've updated the Basic Debouncing page to note about the library working with TouchIn. As well as a link to the examples directory in this repo.