Fix stm32-usbd url

Sh3Rm4n · Sh3Rm4n · commit 9d321f06fdd6 · 2021-08-19T21:24:54.000+02:00
diff --git a/src/lib.rs b/src/lib.rs
@@ -80,7 +80,7 @@
 
  ### `usb`
 
- Enable USB peripherals on supported targets via the [`stm32-usbd`](https://crates.io/crates/sttm32-usbd) crate.
+ Enable USB peripherals on supported targets via the [`stm32-usbd`](https://crates.io/crates/stm32-usbd) crate.
 
  ### `rtc`
 
