* Disambiguate TX/RX direction for UART sample.
* Add more details about terminals.
* Fix a typo in a paragraph.
Change-Id: I14ddc4f1bf5a0c1b7f96114232418a84e4379aa7
Add/update docs for the pw_dumb_io facade and backends. Configures GN
build files such that all the backend docs are built even if the backend
isn't in use.
Change-Id: I91fca1cb2d3f5d4b57ae1f6991a89270a35be1c6