Fix miscellaneous typo
o add a missing opening parenthesis (rmuser.8)
o fix Japanese wording (route6d.8, rpc.lockd.8)
o remove a garbage character (rpc.yppasswdd.8)
o uncapitalize "Poll" in -p description (rtquery.8)

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