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: [email protected] # v5.17
Cc: Christian Brauner <[email protected]>
Cc: Kefeng Wang <[email protected]>
Signed-off-by: Luis Chamberlain <[email protected]>

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