iwlwifi: mvm: docs: fix enum link, provide TX response link

Fix the enum link by adding the missing & and provide the link
to the TX response documentation.

Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Luca Coelho <luciano.coelho@intel.com>
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h b/drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h
index cc6af9b..7a52fb6 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw-api.h
@@ -216,7 +216,8 @@ enum iwl_legacy_cmds {
 	FW_GET_ITEM_CMD = 0x1a,
 
 	/**
-	 * @TX_CMD: uses &struct iwl_tx_cmd or &struct iwl_tx_cmd_gen2
+	 * @TX_CMD: uses &struct iwl_tx_cmd or &struct iwl_tx_cmd_gen2,
+	 *	response in &struct iwl_mvm_tx_resp
 	 */
 	TX_CMD = 0x1c,