Fix link to UweBonnes/wiki_fuer_alex
* STM32F100xx (Medium Density VL, as on the 32VL Discovery board)
* STM32L1xx (STM32L Discovery board)
* STM32F103VC, STM32F107RC, STM32L151RB, STM32F205RE and STM32F405RE on custom boards
- (https://github.com/UweBonnes/wiki_fuer_alex/layout/usps...)
+ from [UweBonnes/wiki_fuer_alex](https://github.com/UweBonnes/wiki_fuer_alex/tree/master/layout)
* STM32F103VET6 (HY-STM32 board)
* STM32F105RCT6 (DecaWave EVB1000 board)
* STM32F303xx (STM32F3 Discovery board)