documentation: Remove outdated icons

docs/configuration/endpoint/index.md

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 !!! question "Since sing-box 1.11.0"
 
 # Endpoint

docs/configuration/endpoint/index.zh.md

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 # 端点

docs/configuration/endpoint/wireguard.md

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 ### Structure

docs/configuration/endpoint/wireguard.zh.md

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 ### 结构

docs/configuration/outbound/hysteria2.md

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     :material-plus: [server_ports](#server_ports)  

docs/configuration/outbound/hysteria2.zh.md

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     :material-plus: [server_ports](#server_ports)