[ZH] Translation of 11-2 (Atcold#495)

* zh-11-2

* added lang and translator info

* Update 11-2.md

* Update _config.yml

Co-authored-by: Alfredo Canziani <[email protected]>

Author: watchernyu

docs/_config.yml

@@ -171,6 +171,7 @@ zh:
     - path: zh/week11/11.md
       sections:
         - path: zh/week11/11-1.md
+        - path: zh/week11/11-2.md
         - path: zh/week11/11-3.md
     - path: zh/week12/12.md
       sections: