Update README.md

Point release to address high uart TX baud rate corruption, at the
expense of throughput.

Also skip over an attempt at UART/SDK optimisation that caused issues
for users.

README.md

@@ -9,7 +9,7 @@ Firmware source for the Raspberry Pi Debug Probe SWD/UART accessory. Can also be
 
 # Documentation
 
-Debug Probe documentation can be found in the [Pico Getting Started Guide](https://datasheets.raspberrypi.com/pico/getting-started-with-pico.pdf). See "Appendix A: Using the Debug Probe".
+Debug Probe documentation can be found at the [Raspberry Pi Microcontroller Documentation portal](https://www.raspberrypi.com/documentation/microcontrollers/debug-probe.html#about-the-debug-probe).
 
 # Hacking
 

src/usb_descriptors.c

@@ -48,7 +48,7 @@ tusb_desc_device_t const desc_device =
 
     .idVendor           = 0x2E8A, // Pi
     .idProduct          = 0x000c, // CMSIS-DAP Debug Probe
-    .bcdDevice          = 0x0221, // Version 02.21
+    .bcdDevice          = 0x0222, // Version 02.22
     .iManufacturer      = 0x01,
     .iProduct           = 0x02,
     .iSerialNumber      = 0x03,