Update ci/chatops/index.md

Remove pricing url from version history

doc/ci/chatops/index.md

@@ -7,8 +7,8 @@ type: index, concepts, howto
 
 # GitLab ChatOps **(FREE)**
 
-> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/4466) in [GitLab Ultimate](https://about.gitlab.com/pricing/) 10.6.
-> - [Moved](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/24780) to [GitLab Free](https://about.gitlab.com/pricing/) in 11.9.
+> - [Introduced](https://gitlab.com/gitlab-org/gitlab/-/merge_requests/4466) in GitLab Ultimate 10.6.
+> - [Moved](https://gitlab.com/gitlab-org/gitlab-foss/-/merge_requests/24780) to GitLab Free in 11.9.
 
 GitLab ChatOps provides a method to interact with CI/CD jobs through chat services
 like Slack. Many organizations' discussion, collaboration, and troubleshooting takes