sched/doc: Fix stale em_pd_energy() reference in sched-energy

The scheduler energy-aware placement documentation refers to the
em_pd_energy() API, which was renamed to em_cpu_energy() in commit
f0b5694791ce ("PM / EM: change name of em_pd_energy to em_cpu_energy").
Update the reference to the current name.

em_cpu_energy() is the EM helper that compute_energy() in
kernel/sched/fair.c calls to estimate a performance domain's energy
consumption (defined in include/linux/energy_model.h).

Sync the zh_CN translation, which carries the same stale name.

Signed-off-by: Liang Luo <luoliang@kylinos.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Reviewed-by: Alex Shi <alexs@kernel.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Message-ID: <20260707085335.2942128-1-luoliang@kylinos.cn>

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