Fix typo (#454)

diff --git a/include/queue.h b/include/queue.h
index 8e42fb5..811a1f3 100644
--- a/include/queue.h
+++ b/include/queue.h
@@ -978,7 +978,7 @@
  * void vBufferISR( void )
  * {
  * char cIn;
- * BaseType_t xHigherPrioritTaskWoken;
+ * BaseType_t xHigherPriorityTaskWoken;
  *
  *  // We have not woken a task at the start of the ISR.
  *  xHigherPriorityTaskWoken = pdFALSE;