Merge #40

40: Simple typo fix r=almindor a=iankronquist

Just poking around and noticed this. Hope it's not too much trouble.

Co-authored-by: Ian Kronquist <iankronquist@gmail.com>

riscv-rt/examples/multi_core.rs

@@ -30,7 +30,7 @@ pub extern "Rust" fn user_mp_hook() -> bool {
                 }
             }
 
-            // Start listening for software interrupts
+            // Stop listening for software interrupts
             mie::clear_msoft();
 
             // Clear IPI