This is an old revision of the document!
In a few of the designs we have done, like the PlutoSDR and M2k there hasn't been enough room on the PCB for serial and JTAG, so we put it on a small breakout board, which communicates to the main platform with a small 10 pin ribbon cable, which is known as the ADALM-UARTJTAG.
This does include the Silicon Labs CP2103-GM USB to UART bridge, which you can plug a USB cable into.
This also includes connection to Xilinx JTAG cable as well. You will need a Xilinx JTAG Cable or equivalent to use it.
Anyone is free to use the same pinout on their platform - or copy the schematics and make it themselves.