Merge pull request #629 from jannic/issue-628

Fix URL of pico_usb_serial example

Author: ithinuel

rp2040-hal/src/usb.rs

@@ -31,7 +31,7 @@
 //! // Use the usb_bus as usual.
 //! ```
 //!
-//! See [pico_usb_serial.rs](https://github.com/rp-rs/rp-hal/tree/main/boards/pico/examples/pico_usb_serial.rs) for more complete examples
+//! See [pico_usb_serial.rs](https://github.com/rp-rs/rp-hal-boards/blob/main/boards/rp-pico/examples/pico_usb_serial.rs) for more complete examples
 //!
 //!
 //! ## Enumeration issue with small EP0 max packet size