doxygen: Fix some warnings

Signed-off-by: Benoît Thébaudeau <benoit.thebaudeau.dev@gmail.com>

cpu/avr/dev/lanc111.c

@@ -170,7 +170,7 @@
  * \addtogroup avr
  * @{ */
 /*!
- * \defgroup xgSmscRegs
+ * \defgroup xgSmscRegs SMSC Registers
  *
  * @{ */
 
@@ -1203,6 +1203,7 @@ PROCESS_THREAD(lanc111_process, ev, data)
     PROCESS_END();
 }
 #endif  /* 0 */
+#if 0
 /*!
  * \brief Send Ethernet packet.
  *
@@ -1213,7 +1214,6 @@ PROCESS_THREAD(lanc111_process, ev, data)
  *
  * \return 0 on success, -1 in case of any errors.
  */
-#if 0
 int LancOutput(NUTDEVICE * dev, NETBUF * nb)
 {
     static u_long mx_wait = 5000;

cpu/avr/radio/rf230bb/halbb.c

@@ -544,6 +544,7 @@ hal_frame_write(uint8_t *write_buffer, uint8_t length)
 }
 
 /*----------------------------------------------------------------------------*/
+#if 0  //Uses 80 bytes (on Raven) omit unless needed
 /** \brief Read SRAM
  *
  * This function reads from the SRAM of the radio transceiver.
@@ -552,7 +553,6 @@ hal_frame_write(uint8_t *write_buffer, uint8_t length)
  * \param length Length of the read burst
  * \param data Pointer to buffer where data is stored.
  */
-#if 0  //Uses 80 bytes (on Raven) omit unless needed
 void
 hal_sram_read(uint8_t address, uint8_t length, uint8_t *data)
 {
@@ -576,6 +576,7 @@ hal_sram_read(uint8_t address, uint8_t length, uint8_t *data)
 }
 #endif
 /*----------------------------------------------------------------------------*/
+#if 0  //omit unless needed
 /** \brief Write SRAM
  *
  * This function writes into the SRAM of the radio transceiver. It can reduce
@@ -585,7 +586,6 @@ hal_sram_read(uint8_t address, uint8_t length, uint8_t *data)
  * \param length  Length of the write burst
  * \param data    Pointer to an array of bytes that should be written
  */
-#if 0  //omit unless needed
 void
 hal_sram_write(uint8_t address, uint8_t length, uint8_t *data)
 {