docs(kuma-dp): fix kuma-dp's transparent-proxy docs

[bartsmykla]

Fix kuma-dp's transparent-proxying docs

• Mentioning not supported nftables is wrong from 2.5.6
• We are not by default excluding port 22 from redirection anymore

Link to updated page: https://deploy-preview-1787--kuma.netlify.app/docs/2.7.x/production/dp-config/transparent-proxying/

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