tcpdump(8) and pcap-filter(5) have the 'mgt' keyword for 802.11
management frames typo'd as as 'mgtv' in the list of subtypes.

diff /usr/src
commit - 6c24eb55e021991196003dc7f0a643e806b14295
path + /usr/src
blob - fae308365fb30e29178ce0b209b141c38392a7e3
file + lib/libpcap/pcap-filter.5
--- lib/libpcap/pcap-filter.5
+++ lib/libpcap/pcap-filter.5
@@ -662,7 +662,7 @@ and frame subtype matches the specified
 If the specified
 .Ar wlan_type
 is
-.Cm mgtv ,
+.Cm mgt ,
 then valid values for
 .Ar wlan_subtype
 are
blob - e457cf37556709da6224c80f3c5147b8c245891e
file + usr.sbin/tcpdump/tcpdump.8
--- usr.sbin/tcpdump/tcpdump.8
+++ usr.sbin/tcpdump/tcpdump.8
@@ -958,7 +958,7 @@ and frame subtype matches the specified
 If the specified
 .Ar wlan_type
 is
-.Cm mgtv ,
+.Cm mgt ,
 then valid values for
 .Ar wlan_subtype
 are