nimble/host: Fix ble_gattc_indicate_custom comment
@@ -488,8 +488,9 @@ int ble_gattc_notify_custom(uint16_t conn_handle, uint16_t att_handle,
int ble_gattc_notify(uint16_t conn_handle, uint16_t chr_val_handle);
/**
- * Sends a characteristic indication. The content of the message is read from
- * the specified characteristic.
+ * Sends a "free-form" characteristic indication. The provided mbuf contains
+ * the indication payload. This function consumes the supplied mbuf regardless
+ * of the outcome.
*
* @param conn_handle The connection over which to execute the
* procedure.
