Fix mistranslation and typo
o fix mistranslation about multicast (rwhod.8)
o add a missing line to configuration file example, and fix typo (scpsd.8)
o fix Japanese wording (stlstats.8)
o use Dq instead of Pq to quote a word "bunching" (stlstty.8)
o fix typo (traceroute.8)

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