Mention necessary GND (ground) connection to enable flashing

The description has not been entirely clear abouth the necessity of a ground connection between the fpc connector and usb-serial device. 

While this is essential, it is not obvious from the pictures provided. This is hereby fixed.
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Andreas Schreiner 2024-12-15 20:27:24 +00:00 committed by GitHub
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@ -21,10 +21,11 @@ here is the process:
3 is TX(PA9)
4 is RX(PA10)
## 1st pin of UART on board
![7130803](https://github.com/user-attachments/assets/eeed0c0a-ea86-4496-b931-dcc074835eca)
Do not forget to **also connect GND** (ground) between the fpc 6p connector and the serial-usb converter.
## Flashing command
```