Suspected typo in NRF library source.

[The-Futurist]

This comment:

https://github.com/MaJerle/stm32f429/blob/main/00-STM32F429_LIBRARIES/tm_stm32f4_nrf24l01.c#L272

Says that for 1000 uS we set ARD to 4, but I think 1000 is actually represented by the value 3.