Fix links in some pages

This PR fixes some links that are using redirect records or dangling.

content/en/docs/contribute/participate/_index.md

@@ -115,6 +115,6 @@ SIG Docs approvers. Here's how it works.
 
 For more information about contributing to the Kubernetes documentation, see:
 
-- [Contributing new content](/docs/contribute/new-content/overview/)
+- [Contributing new content](/docs/contribute/new-content/)
 - [Reviewing content](/docs/contribute/review/reviewing-prs)
 - [Documentation style guide](/docs/contribute/style/)

content/en/docs/contribute/participate/roles-and-responsibilities.md

@@ -32,7 +32,7 @@ Anyone can:
 - Suggest improvements on [Slack](https://slack.k8s.io/) or the
   [SIG docs mailing list](https://groups.google.com/forum/#!forum/kubernetes-sig-docs).
 
-After [signing the CLA](/docs/contribute/new-content/overview/#sign-the-cla), anyone can also:
+After [signing the CLA](https://github.com/kubernetes/community/blob/master/CLA.md), anyone can also:
 
 - Open a pull request to improve existing content, add new content, or write a blog post or case study
 - Create diagrams, graphics assets, and embeddable screencasts and videos