docs: net: fix minor issues with strparser docs

Not sure if anyone would read this doc, but the API has evolved
since it was written. Update to:
- show the int return type for strp_init()
- refer to strp_data_ready(), not the old strp_tcp_data_ready() name
- direct users to strp_msg(skb) for strparser metadata instead of
  treating skb->cb as struct strp_msg directly

Link: https://patch.msgid.link/20260613165846.2913092-4-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

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