soc: ti: k3-ringacc: Fixup documentation errors

Fixup couple of misses in documentation. This squashes the following
warnings:
drivers/soc/ti/k3-ringacc.c:135: warning: Function parameter or member 'tdown_complete' not described in 'k3_ring_state'
drivers/soc/ti/k3-ringacc.c:238: warning: expecting prototype for struct k3_ringacc. Prototype was for struct k3_ringacc_soc_data instead

While at this, replace "w/a" to indicate workaround to help clarify.

Cc: Peter Ujfalusi <peter.ujfalusi@gmail.com>
Reviewed-by: Randy Dunlap <rdunlap@infradead.org>
Link: https://lore.kernel.org/r/20230621023442.275128-1-nm@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>

drivers/soc/ti/k3-ringacc.c

@@ -125,6 +125,7 @@ struct k3_ring_ops {
  * @occ: Occupancy
  * @windex: Write index
  * @rindex: Read index
+ * @tdown_complete: Tear down complete state
  */
 struct k3_ring_state {
 	u32 free;
@@ -192,7 +193,7 @@ struct k3_ringacc_ops {
  * @num_rings: number of ring in RA
  * @rings_inuse: bitfield for ring usage tracking
  * @rm_gp_range: general purpose rings range from tisci
- * @dma_ring_reset_quirk: DMA reset w/a enable
+ * @dma_ring_reset_quirk: DMA reset workaround enable
  * @num_proxies: number of RA proxies
  * @proxy_inuse: bitfield for proxy usage tracking
  * @rings: array of rings descriptors (struct @k3_ring)
@@ -229,9 +230,9 @@ struct k3_ringacc {
 };
 
 /**
- * struct k3_ringacc - Rings accelerator SoC data
+ * struct k3_ringacc_soc_data - Rings accelerator SoC data
  *
- * @dma_ring_reset_quirk:  DMA reset w/a enable
+ * @dma_ring_reset_quirk:  DMA reset workaround enable
  */
 struct k3_ringacc_soc_data {
 	unsigned dma_ring_reset_quirk:1;