Fix broken links.

Co-authored-by: Frederic Pillon <frederic.pillon@st.com>
Signed-off-by: Zachary J. Fields <zachary_fields@yahoo.com>

Author: zfields

README.md

@@ -777,7 +777,7 @@ User can add a STM32 based board following this [wiki](https://github.com/stm32d
 | Status | Device(s) | Name | Release | Notes |
 | :----: | :-------: | ---- | :-----: | :---- |
 | :green_heart:  | STM32L4R5ZIYx | [Swan R5](https://blues.com/products/swan)  |  *2.1.0*  | |
-| :yellow_heart: | STM32L433CC   | [Cygnet](https://blues.com/products/cygnet) | **2.8.0** | |
+| :yellow_heart: | STM32L433CC   | [Cygnet](https://blues.com/products) | **2.8.0** | |
 
 ### [Elecgator](https://www.elecgator.com/) boards