Update docs

docs/cloud/CNCF/CNCF.md

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+# CNCF
+
+## Guides/Roadmaps/misc...etc
+
+* [landscape](https://landscape.cncf.io/)

docs/cloud/CNCF/Observability.md

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+# Observability
+
+## OpenTelemetry
+
+* [Day17--在 Opentelemetry 中，是如何發起trace/span ](https://ithelp.ithome.com.tw/articles/10361412)
+* [Day18--寫一個有關trace的sdk(上)--攔截接收的請求](https://ithelp.ithome.com.tw/articles/10362059)
+* [Day19-- 寫一個有關trace的sdk(下)--攔截發起的請求](https://ithelp.ithome.com.tw/articles/10362637)
+* [OpenTelemetry 入門指南：建立全面可觀測性架構（iThome鐵人賽系列書）【軟精裝】](https://www.tenlong.com.tw/products/9786263338739)
+* [OpenTelemtry - Resource Detector & Context Propagation](https://itplus.ithome.com.tw/webinar-page/234)

docs/network/http/http.md

@@ -6,4 +6,5 @@
     * [dev/HTTP/1 vs HTTP/2 vs HTTP/3](https://dev.to/accreditly/http1-vs-http2-vs-http3-2k1c)
     * [CloudFlare/HTTP/2 與 HTTP/1.1 的比較：其如何影響 Web 效能？](https://www.cloudflare.com/zh-tw/learning/performance/http2-vs-http1.1/)
 * [Cross-Origin Resource Sharing (CORS)](https://developer.mozilla.org/en-US/docs/Web/HTTP/CORS)
-* [nghttp2 - HTTP/2 C Library and tools ](https://github.com/nghttp2/nghttp2)
+* [nghttp2 - HTTP/2 C Library and tools ](https://github.com/nghttp2/nghttp2)
+* [Trace Context](https://www.w3.org/TR/trace-context/)