chore: change log for gw_jt808 and gw_ocpp

changes/ee/feat-11883.en.md

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+Introduced a new gateway for vehicles to access EMQX through the JT/T 808 protocol.

changes/ee/feat-11885.en.md

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+Introduced a new gateway for Electric vehicle (EV) charging stations to access EMQX through the OCPP (Open Charge Point Protocol).