NFSD: Document and rename the NFSv4.1 session slot shrinker callbacks

Clean up: To prevent their reuse by generic code, rename the NFSv4.1
session slot shrinker's callback functions to make it clear they are
for use only by the shrinker.

Though they are static, callbacks are invoked from outside nfsd.ko,
so they need appropriate kdoc comments that document their API
contracts.

Reviewed-by: NeilBrown <neil@brown.name>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Benjamin Coddington <bcodding@hammerspace.com>
Link: https://patch.msgid.link/20260610-nfsd-slot-growth-clamp-v1-4-7b966700df0b@kernel.org
Signed-off-by: Chuck Lever <cel@kernel.org>

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