Update roadmap.md (#6939)

Fixing typo

Signed-off-by: Charlie Le <[email protected]>

Author: CharlieTLe

docs/roadmap.md

@@ -40,8 +40,8 @@ For more information tracking this, please see [issue #4322](https://github.com/
 
 ## Changes to this Roadmap
 
-Changes to this roadmap will take the form of pull requests containing the suggested change. All such PRs must be posted to the `#cortex` Slack channel in
-Kubernetes slack so that they're made visible to all other developers and maintainers.
+Changes to this roadmap will take the form of pull requests containing the suggested change. All such PRs must be posted to the [#cortex](https://cloud-native.slack.com/archives/CCYDASBLP) Slack channel in
+the [CNCF slack](https://communityinviter.com/apps/cloud-native/cncf) so that they're made visible to all other developers and maintainers.
 
 Significant changes to this document should be discussed in the [monthly meeting](https://github.com/cortexproject/cortex?tab=readme-ov-file#engage-with-our-community)
 before merging, to raise awareness of the change and to provide an opportunity for discussion. A significant change is one which meaningfully alters