Minor: Documentation update

doc/rawapi.txt

@@ -458,6 +458,9 @@ assembly or inline replacements for htons() and htonl()
 if you're using a little-endian architecture.
 #define lwip_htons(x) <your_htons>
 #define lwip_htonl(x) <your_htonl>
+If you #define them to htons() and htonl(), you should
+#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from
+defining hton*/ntoh* compatibility macros.
 
 Check your network interface driver if it reads at
 a higher speed than the maximum wire-speed. If the

src/core/def.c

@@ -11,6 +11,10 @@
  * \#define lwip_htonl(x) your_htonl
  *
  * Note lwip_ntohs() and lwip_ntohl() are merely references to the htonx counterparts.
+ * 
+ * If you #define them to htons() and htonl(), you should
+ * \#define LWIP_DONT_PROVIDE_BYTEORDER_FUNCTIONS to prevent lwIP from
+ * defining htonx/ntohx compatibility macros.
  */
 
 /*