Update example link in USBMIDI.md

Update example link to reflect new shortened name.

Author: Amanda Butler

docs/api/usb/USBMIDI.md

@@ -28,4 +28,4 @@ Below is an example to send a series of MIDI notes to the host PC:
 
 You can use USBMIDI to play an entire song, not just a series of notes. "Take Me Out to the Ball Game" is a popular song in the public domain. To play "Take Me Out to the Ball Game" (public domain) using MIDI over USB on the host PC:
 
-[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_USB/USBMIDI_Take_Me_Out_to_the_Ball_Game)](https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_USB/USBMIDI_Take_Me_Out_to_the_Ball_Game/main.cpp)
+[![View code](https://www.mbed.com/embed/?url=https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_USB/USBMIDI_Take_Me_Out)](https://github.com/ARMmbed/mbed-os-examples-docs_only/blob/master/APIs_USB/USBMIDI_Take_Me_Out/main.cpp)