Fix doxygen parsing in my last commit
diff --git a/src/include/lwip/arch.h b/src/include/lwip/arch.h
index be09176..66adb77 100644
--- a/src/include/lwip/arch.h
+++ b/src/include/lwip/arch.h
@@ -193,7 +193,7 @@
/** Packed structs support.
* Placed between end of declaration of a packed struct and trailing semicolon. \n
* For examples of packed struct declarations, see include/lwip/prot/ subfolder. \n
- * Porting to GCC/clang: \#define PACK_STRUCT_STRUCT __attribute__((packed))
+ * Porting to GCC/clang: \#define PACK_STRUCT_STRUCT \_\_attribute\_\_((packed))
*/
#ifndef PACK_STRUCT_STRUCT
#define PACK_STRUCT_STRUCT