Add licenses for kcp-go and smux
tor-browser#34043 (closed) added the kcp-go and smux projects. Their licenses should be added to Docs/Licenses/PluggableTransports.
https://github.com/xtaci/kcp-go/blob/v5.5.11/LICENSE https://github.com/xtaci/smux/blob/v1.5.12/LICENSE
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