net_shaper: add some notes on re-parenting

Clarify the re-parenting expectations. Specifically that @delete
on a queue removes it from the hierarchy which is a bit unusual
in the overall API structure.

IIRC the implicit delete behavior was introduced because otherwise
it would not be possible to remove a queue from the hierarchy
without changing at least one handle of the shapers. Normally
"removal" is done by "adding" to the new parent, but "outside
the hierarchy" does not have a parent we can point at.

Link: https://patch.msgid.link/20260724210756.1553565-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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