Correct doc heading text

doc/ci/caching/index.md

@@ -447,7 +447,7 @@ is stored on the machine where GitLab Runner is installed. The location also dep
 If you use cache and artifacts to store the same path in your jobs, the cache might
 be overwritten because caches are restored before artifacts.
-### Segregation of caches between protected and non-protected branches
+#### Cache key names
 > [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/330047) in GitLab 15.0.