Typo

Signed-off-by: Gilles Peskine <Gilles.Peskine@arm.com>
diff --git a/library/threading_internal.h b/library/threading_internal.h
index aba729d..354d6cb 100644
--- a/library/threading_internal.h
+++ b/library/threading_internal.h
@@ -1,5 +1,5 @@
 /**
- * \file threadinginternal.h
+ * \file threading_internal.h
  *
  * \brief Threading interfaces used by the test framework
  */