docs: fix driver sphinx warnings

components/driver/include/driver/rmt_encoder.h

@@ -15,10 +15,9 @@
 extern "C" {
 #endif
 
-/**
- * @brief Type of RMT encoder
- */
+/** @cond */
 typedef struct rmt_encoder_t rmt_encoder_t;
+/** @endcond */
 
 /**
  * @brief RMT encoding state

components/driver/include/driver/spi_master.h

@@ -45,7 +45,9 @@ extern "C"
 #define SPI_DEVICE_DDRCLK                  (1<<7)
 #define SPI_DEVICE_NO_RETURN_RESULT        (1<<8)  ///< Don't return the descriptor to the host on completion (use post_cb to notify instead)
 
+/** @cond */
 typedef struct spi_transaction_t spi_transaction_t;
+/** @endcond */
 typedef void(*transaction_cb_t)(spi_transaction_t *trans);
 
 /**

components/driver/include/driver/spi_slave.h

@@ -25,7 +25,9 @@ extern "C"
 #define SPI_SLAVE_BIT_LSBFIRST            (SPI_SLAVE_TXBIT_LSBFIRST|SPI_SLAVE_RXBIT_LSBFIRST) ///< Transmit and receive LSB first
 #define SPI_SLAVE_NO_RETURN_RESULT        (1<<2)  ///< Don't return the descriptor to the host on completion (use `post_trans_cb` to notify instead)
 
+/** @cond */
 typedef struct spi_slave_transaction_t spi_slave_transaction_t;
+/** @endcond */
 typedef void(*slave_transaction_cb_t)(spi_slave_transaction_t *trans);
 
 /**