s4mk3: expand explanation of effects handling and usage #788
Description
I was not able to figure out how to work with effects just by playing around, and the table is very hard to read because it's meant as a reference, not for learning. We should have a narrative section of the manual, similar to the Motor and Jogwheel sections, that walk users through loading and switching effects, assigning them to one bank or the other, activating them, and using them.