docs: add change logs

changes/v5.0.18/fix-9961.en.md

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+Avoid parsing config files for node name and cookie when executing non-boot commands in bin/emqx

changes/v5.0.18/fix-9961.zh.md

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+在 bin/emqx 脚本中，避免在运行非启动命令时解析 emqx.conf 来获取节点名称和 cookie