Bluetooth: Controller: Add sync established code comment

Add code comment related to sync context field used to
indicate the sync established event being generated towards
HCI Layer.

Co-authored-by: Piotr Pryga <[email protected]>
Signed-off-by: Vinayak Kariappa Chettimada <[email protected]>

Author: 2 people

subsys/bluetooth/controller/ll_sw/ull_sync_types.h

@@ -21,6 +21,10 @@ struct ll_sync_set {
 	uint16_t volatile timeout_reload; /* Non-zero when sync established */
 	uint16_t timeout_expire;
 
+	/* Member to store periodic advertising sync prepare.
+	 * Also serves as a flag to inform if sync established was
+	 * already generated.
+	 */
 	void (*lll_sync_prepare)(void *param);
 
 #if defined(CONFIG_BT_CTLR_CHECK_SAME_PEER_SYNC) || \