docs: cgroup-v2: mark memory.pressure and io.pressure as read-write

The cgroup-v2 documentation describes memory.pressure and io.pressure as
"read-only nested-keyed file", but both files accept trigger writes
(cgroup_memory_pressure_write / cgroup_io_pressure_write) and are therefore
read-write. cpu.pressure and irq.pressure are already documented as
read-write, so this also resolves an internal inconsistency.

Signed-off-by: Tao Cui <cuitao@kylinos.cn>
Signed-off-by: Tejun Heo <tj@kernel.org>

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