Fix cpupower-frequency-info.1 man page typo

cpupower-frequency-info.1 man page type is incorrect for
related-cpus. Fix it.

utils/cpufreq-info.c
        {"related-cpus",  no_argument,   NULL,   'r'},
        {"affected-cpus", no_argument,   NULL,   'a'},

Fixed changelog before applying:
Shuah Khan <skhan@linuxfoundation.org>

Signed-off-by: Jan Kratochvil <jan@jankratochvil.net>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>