correct man page a little
correct man page a little

timduru/platform-external-iw,CTU-IIG/802.11p-iw,bcopeland/android_iw,chunyeow/iw,SoluMachines/external_iw,chunyeow/iw,idor/iw,ewa/iw-modified,Distrotech/iw,cozybit/iw,TeamEOS/external_iw,greearb/iw-ct,CTU-IIG/802.11p-iw,bw-oss/iw,OSLL/iw,TeamEOS/external_iw,OSLL/iw,bw-oss/iw,bcopeland/android_iw,timduru/platform-external-iw,ewa/iw-modified,idor/iw,cozybit/iw,SoluMachines/external_iw,greearb/iw-ct,Distrotech/iw