drm/i915: Fix documentation for intel_uncore_forcewake_put__locked

intel_uncore_forcewake_put__locked() is used to release a reference.

Fixes: a6111f7b ("drm/i915: Reduce locking in execlist command submission")
Signed-off-by: Miaoqian Lin <linmq006@gmail.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20221207112909.2655251-1-linmq006@gmail.com