cpufreq: cpu0: Fix mistake in Documentation example

"clock-latency" is incorrectly written as "transition-latency" in an example
present in Documentation of cpufreq-cpu0. Fix it.

Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>