Updated /products links to /pricing, CE to EE port

doc/ci/variables/README.md

@@ -574,7 +574,7 @@ Below you can find supported syntax reference:
     `/pattern/i` to make a pattern case-insensitive.
 
 [ee-2112]: https://gitlab.com/gitlab-org/gitlab-ee/merge_requests/2112
-[premium]: https://about.gitlab.com/products/ "Available only in GitLab Premium"
+[premium]: https://about.gitlab.com/pricing/ "Available only in GitLab Premium"
 [ce-13784]: https://gitlab.com/gitlab-org/gitlab-ce/issues/13784 "Simple protection of CI variables"
 [envs]: ../environments.md
 [protected branches]: ../../user/project/protected_branches.md