fcntl.2, msgget.2, ptrace.2, request_key.2, shmget.2, sigaction.2, syscalls.2, dbopen...

fcntl.2, msgget.2, ptrace.2, request_key.2, shmget.2, sigaction.2, syscalls.2, dbopen.3, euidaccess.3, getgrnam.3, getpwnam.3, strfmon.3, strtol.3, strtoul.3, cciss.4, hpsa.4, mouse.4, termcap.5, charsets.7, iso_8859-16.7, iso_8859-2.7, koi8-r.7, unicode.7, utf-8.7: Use Oxford comma

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>