fterrors.h: Fix documentation extraction of `FT_Error_String`.
diff --git a/include/freetype/fterrors.h b/include/freetype/fterrors.h
index 3575cc5..151941d 100644
--- a/include/freetype/fterrors.h
+++ b/include/freetype/fterrors.h
@@ -281,6 +281,8 @@
   FT_EXPORT( const char* )
   FT_Error_String( FT_Error  error_code );
 
+  /* */
+
 FT_END_HEADER