docs: networking: document NAPI

Add basic documentation about NAPI. We can stop linking to the ancient
doc on the LF wiki.

Link: https://lore.kernel.org/all/[email protected]/
Reviewed-by: Bagas Sanjaya <[email protected]>
Reviewed-by: Toke Høiland-Jørgensen <[email protected]>
Acked-by: Pavel Pisa <[email protected]> # for ctucanfd-driver.rst
Reviewed-by: Tony Nguyen <[email protected]>
Reviewed-by: Florian Fainelli <[email protected]>
Reviewed-by: Stephen Hemminger <[email protected]>
Reviewed-by: Randy Dunlap <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Jakub Kicinski <[email protected]>

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