docs: ABI: sysfs-kernel-slab: mark cpu_partial attributes deprecated

The per-cpu slab and per-cpu partial slab mechanisms were removed when
SLUB was fully converted to per-cpu sheaves in Linux 7.0. The cpu_slabs,
slabs_cpu_partial and cpu_partial sysfs attributes were kept as stubs
that always return 0 for backwards compatibility, but their
documentation still described them as if they were functional.

Update the three descriptions to state that the attributes are
deprecated and always read 0, and note that they are retained only for
compatibility. While here, fix a "partialli" typo in the
slabs_cpu_partial description.

Signed-off-by: Seongjun Hong <hsj0512@snu.ac.kr>
Acked-by: Harry Yoo (Oracle) <harry@kernel.org>
Link: https://patch.msgid.link/20260701141755.85119-1-hsj0512@snu.ac.kr
Signed-off-by: Vlastimil Babka (SUSE) <vbabka@kernel.org>

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