Fixup: Correct Doxygen file name primitive in md_internal.h
diff --git a/include/mbedtls/md_internal.h b/include/mbedtls/md_internal.h
index 38f89db..87f7837 100644
--- a/include/mbedtls/md_internal.h
+++ b/include/mbedtls/md_internal.h
@@ -1,5 +1,5 @@
  /**
- * \file md.h
+ * \file md_internal.h
  *
  * \brief This file contains the generic message-digest wrapper.
  *