Updated docs to add Wavehsare OpenH743I-C to STM32 boards list.

docs/boards.md

@@ -170,6 +170,7 @@ This code base already had supported for a handful of following boards (sorted a
 - [STM32 H743zi Nucleo](https://www.st.com/en/evaluation-tools/nucleo-h743zi.html)
 - [STM32 H743i Evaluation](https://www.st.com/en/evaluation-tools/stm32h743i-eval.html)
 - [STM32 H745i Discovery](https://www.st.com/en/evaluation-tools/stm32h745i-disco.html)
+- [Waveshare OpenH743I-C](https://www.waveshare.com/openh743i-c-standard.htm)
 
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