!761 Done! !665 【轻量级 PR】：update zh-cn/contribute/贡献流程.md.

Merge pull request !761 from wusongqing/665

en/contribute/contribution-process.md

@@ -81,6 +81,7 @@ Perform the following steps to download the code in the repository to your compu
     Update your local branch.
 
     ```
+    git remote add origin $remote_link
     git fetch origin
     git checkout master  
     git pull --rebase