Fix miscellaneous typo
o mail.local.8 (`From'' should be `From '')
o mount_nfs.8 (BIRBLKSIZ should be DIRBLKSIZ)
o mknetid.8 (.Nm /var/yp/Makefile should be .Pa ...)
o named-bootconf.8 (fix Japanese wording)
Submitted by: Satoru Koizumi <koizumi@cms.phys.s.u-tokyo.ac.jp>