docs: update CLA comments contents.

.github/workflows/go-build-test.yml

@@ -7,6 +7,9 @@ on:
   pull_request:
     branches:
       - main
+    paths-ignore:
+      - '**/*.md'
+
   workflow_dispatch:
 
 jobs:

CONTRIBUTING-zh_CN.md

@@ -77,7 +77,7 @@ git push origin fix-bug-123
 ### 9. 签署 CLA
 如果这是你第一次提交 PR，你需要在 PR 的评论中回复：
 ```
-I have read the CLA Document and I hereby sign the CLA
+The signature to be committed in order to sign the CLA
 ```
 
 ### 编程规范

CONTRIBUTING.md

@@ -75,7 +75,7 @@ Go to your fork on GitHub and click the "Pull Request" button. Ensure the PR des
 ### 9. Sign the CLA
 If this is your first time submitting a PR, you will need to reply in the comments of the PR:
 ```
-I have read the CLA Document and I hereby sign the CLA
+The signature to be committed in order to sign the CLA
 ```
 
 ### Programming Standards