Fix type

Author: aardvark179

src/main/java/org/truffleruby/core/mutex/MutexNodes.java

@@ -138,7 +138,7 @@ protected Object synchronize(RubyMutex mutex, RubyProc block,
                 throw new RaiseException(getContext(), coreExceptions().threadErrorRecursiveLocking(this));
             }
 
-            /* This code uses lock/unlock because the list of owned locks must be maintained. Use code can unlock a
+            /* This code uses lock/unlock because the list of owned locks must be maintained. User code can unlock a
              * mutex inside a synchronize block, and then relock it before exiting the block, and we need the owned
              * locks list to be in consistent state at the end. */
             MutexOperations.lock(getContext(), lock, thread, this);