doc: lilygo: adopt zephyr:board-supported-hw directive

Replace manually authored hardware features table with the new Zephyr
board supported hardware directive which automatically generates an
up-to-date table based on the boards' Devicetree.
Removed some typos.

Co-authored-by: Benjamin Cabé <benjamin@zephyrproject.org>

Signed-off-by: Lothar Felten <lothar.felten@gmail.com>