remove reference to venctl, update wording

Signed-off-by: Ashley Davis <ashley.davis@cyberark.com>

Author: SgtCoDFish

RELEASE.md

@@ -64,9 +64,9 @@ The release process is semi-automated.
 
 7. Publish the release.
 
-8. Inform the `#venctl` channel that a new version of Discovery Agent has been
-   released. Make sure to share any breaking change that may affect `venctl connect`
-   or `venctl generate`.
+8. Inform the `#venafi-kubernetes-agent` channel on Slack that a new version of the Venafi Discovery Agent has been
+   released (and that a new version of the disco-agent has been released!)a
+   TODO: Who should be notified on the disco side?
 
 9. Inform the docs team of the new release so they can update the
    documentation at <https://docs.cyberark.com/>.