Doc update: using serial terminal on Linux

[r.leita]

To add to the above I found this post particularly useful for the BP under Linux (paricularly the config file settings):

Screen and Linux tips

While screen is an excellent tool, I’d highly recommend checking out tio, which is a serial terminal emulator specifically designed for hardware hacking/development: It has a lot of nice features, such as defaulting to 115200 8n1 and gracefully reconnecting when a serial device goes down and comes back up (like when updating the firmware on the BP5). It also offers a remapping function which can fix some of the unusual behaviors the BP exhibits under different platforms (such as backspace not…