proc_sysctl: enhance documentation
Expand documentation to clarify:
o that paths don't need to exist for the new API callers
o clarify that we *require* callers to keep the memory of
the table around during the lifetime of the sysctls
o annotate routines we are trying to deprecate and later remove
Cc: stable@vger.kernel.org # v5.17
Cc: Christian Brauner <brauner@kernel.org>
Cc: Kefeng Wang <wangkefeng.wang@huawei.com>
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
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