I may have just found the answer: In MiniProg3 manual there is this drawing:
So this tells me MAYBE there is a problem? If I only use SWD on the programmer and do not switch it to JTAG then probably it is OK to tied my debug uart to pin 6 and pin 8. and it appears that pin 6 is SWV or the debug uart so I need to connect my UART_TX to pin6 and UART_RX to pin8 ????
If you are going to use the SWD debugging with the Miniprog3, then you won't be able to use pin 6 for the UART. If you don't care about SWD debugging, then you can probably get away with using the pins 6 and 8 for the UART output/input.
I've been able to run/test my own miniprog3 debugging using only the 5-pin assignment for SWD, so you you won't need the SWV pin unless you want the extra debug functionality and decide to use the 10-pin connection.