DOCSP-28645 Standardize release note landing page behavior (#6056) (#6063)

Author: jeff-allen-mongo

snooty.toml

@@ -178,10 +178,12 @@ toc_landing_pages = [
    "/release-notes/4.4-downgrade",
    "/release-notes/4.4",
    "/release-notes/5.0",
+   "/release-notes/5.0-downgrade",
    "/release-notes/5.1",
    "/release-notes/5.2",
    "/release-notes/5.3",
    "/release-notes/6.0",
+   "/release-notes/6.0-downgrade",
    "/replication",
    "/security",
    "/sharding",