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Corrected and clarified special instructions for RAK4631. (#1525)

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Info is from a support request to RAK. I have not yet tried the 19003 - will update if necessary when I do.

Co-authored-by: rcarteraz <robert.l.carter2@gmail.com>
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docs/configuration/module/serial.mdx
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@ -53,7 +53,7 @@ Available Values:
Set the GPIO pin to the RXD pin you have set up.
:::tip
With RAK4631, the default pins are TXD1 and RXD1 on the baseboard. For this device, setting [GPS Mode](/docs/configuration/radio/position/#gps-mode) to `Not_Present` will prevent a pin conflict.
With the RAK4631 on the RAK19007 and some versions of the RAK19003 baseboards, the default pins are TXD1 (16) and RXD1 (15). For this device, setting [GPS Mode](/docs/configuration/radio/position/#gps-mode) to `Not_Present` is necessary. For other versions of the RAK19003 baseboard, the pins TXD0 (20) and RXD0 (19) are accessible.
:::
### Transmit GPIO Pin