Move rawapi.txt description to main page - this doc really should be found and read by users

src/core/raw.c

@@ -6,7 +6,7 @@
  * See also @ref raw_raw
  * 
  * @defgroup raw_raw RAW
- * @ingroup raw_api
+ * @ingroup callbackstyle_api
  * Implementation of raw protocol PCBs for low-level handling of
  * different types of protocols besides (or overriding) those
  * already available in lwIP.\n

src/core/tcp.c

@@ -4,7 +4,7 @@
  * See also @ref tcp_raw
  *
  * @defgroup tcp_raw TCP
- * @ingroup raw_api
+ * @ingroup callbackstyle_api
  * Transmission Control Protocol for IP\n
  * @see @ref raw_api and @ref netconn
  *

src/core/udp.c

@@ -5,7 +5,7 @@
  * See also @ref udp_raw
  * 
  * @defgroup udp_raw UDP
- * @ingroup raw_api
+ * @ingroup callbackstyle_api
  * User Datagram Protocol module\n
  * @see @ref raw_api and @ref netconn
  */