Remove implicit grouping for PIO defines (#779)
diff --git a/src/rp2_common/hardware_pio/include/hardware/pio.h b/src/rp2_common/hardware_pio/include/hardware/pio.h
index fd5499a..39a1a45 100644
--- a/src/rp2_common/hardware_pio/include/hardware/pio.h
+++ b/src/rp2_common/hardware_pio/include/hardware/pio.h
@@ -73,20 +73,16 @@
* e.g. pio_gpio_init(pio0, 5)
*
* \ingroup hardware_pio
- * @{
*/
#define pio0 pio0_hw
-/** @} */
/** Identifier for the second (PIO 1) hardware PIO instance (for use in PIO functions).
*
* e.g. pio_gpio_init(pio1, 5)
*
* \ingroup hardware_pio
- * @{
*/
#define pio1 pio1_hw
-/** @} */
/** \brief PIO state machine configuration
* \defgroup sm_config sm_config
