add pinetab docs

docs/software/pinetab.md

@@ -2,12 +2,12 @@
 
 These are **preliminary** notes on support for Meshtastic in the Pinetab.
 
-A RF95 is connected via a CS341 USB-SPI chip.
+A RF95 is connected via a CH341 USB-SPI chip.
 
 Pin assignments:
-CS0 from RF95 goes to CS0 on CS341
+CS0 from RF95 goes to CS0 on CH341
-DIO0 from RF95 goes to INT on CS341
+DIO0 from RF95 goes to INT on CH341
-RST from RF95 goes to RST on CS341
+RST from RF95 goes to RST on CH341
 
 This linux driver claims to provide USB-SPI support: https://github.com/gschorcht/spi-ch341-usb
 Notes here on using that driver: https://www.linuxquestions.org/questions/linux-hardware-18/ch341-usb-to-spi-adaptor-driver-doesn%27t-work-4175622736/