Fix typos
o Remove period which does not terminate Japanese sentence (cu.1)
o Fix Japanese wording (df.1)
o Use Pa macro where used by original (whois.1)
o Fix inversed translation of -Q description (whois.1)
o Add missing .Fl 6 (whois.6)
o Fix broken description for cursormodes([modes]) (window.1)

Submitted by: Satoru Koizumi <koizumi@cms.phys.s.u-tokyo.ac.jp>