wifi: regulatory: remove extra documentation

The struct member country_ie_checksum doesn't exist, so
don't document it.

Link: https://msgid.link/20240515093852.ebcc9673558b.Ie0b58c1249c6375c60859fa6474d7cdd8862b065@changeidSigned-off-by: Johannes Berg <johannes.berg@intel.com>

include/net/regulatory.h

@@ -71,8 +71,6 @@ enum environment_cap {
  *	CRDA and can be used by other regulatory requests. When a
  *	the last request is not yet processed we must yield until it
  *	is processed before processing any new requests.
- * @country_ie_checksum: checksum of the last processed and accepted
- *	country IE
  * @country_ie_env: lets us know if the AP is telling us we are outdoor,
  *	indoor, or if it doesn't matter
  * @list: used to insert into the reg_requests_list linked list