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[zh] Update docs/concepts/wasm (#11936) 

Signed-off-by: xin.li <xin.li@daocloud.io>

Signed-off-by: xin.li <xin.li@daocloud.io>
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@ -35,20 +35,11 @@ Istio 扩展（Proxy-Wasm 插件）有几个组成部分：
## 例子 {#example}
[这里](https://github.com/envoyproxy/envoy-wasm/tree/19b9fd9a22e27fcadf61a06bf6aac03b735418e6/examples/wasm)是用 C++ 为过滤器实现 Proxy-Wasm 插件的例子。
为过滤器实现一个 Proxy-Wasm 插件需要：
- 实现一个继承了 [base context 类](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/api/wasm/cpp/proxy_wasm_impl.h#L288)的 [root context 类](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/examples/wasm/envoy_filter_http_wasm_example.cc#L7)。
- 实现一个继承了 [base context 类](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/api/wasm/cpp/proxy_wasm_impl.h#L314)的 [流 context 类](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/examples/wasm/envoy_filter_http_wasm_example.cc#L14)。
- 重写 [context API](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/examples/wasm/envoy_filter_http_wasm_example.cc#L14) 的方法，以此处理来自主机的相应初始化和流事件。
- [注册](https://github.com/envoyproxy/envoy-wasm/blob/e8bf3ab26069a387f47a483d619221a0c482cd13/examples/wasm/envoy_filter_http_wasm_example.cc#L26) 这个 `root context` 和流 `stream context`。
## SDK
C++ SDK 的详细说明见[这里](https://github.com/proxy-wasm/proxy-wasm-cpp-sdk/tree/a30aaeedf30cc1545318505574c7fb3bb8d8c243/docs/wasm_filter.md)。
您可以按照[本指南](https://github.com/istio-ecosystem/wasm-extensions/blob/master/doc/write-a-wasm-extension-with-cpp.md)使用 C++ 实现 Wasm 扩展。
## 生态 {#ecosystem}
- [Istio 生态 Wasm 扩展](https://github.com/istio-ecosystem/wasm-extensions)
- [Proxy-Wasm ABI 说明](https://github.com/proxy-wasm/spec)
- [Proxy-Wasm C++ SDK](https://github.com/proxy-wasm/proxy-wasm-cpp-sdk)
- [Proxy-Wasm Rust SDK](https://github.com/proxy-wasm/proxy-wasm-rust-sdk)