DOCS-11866, DOCS-11882: updates to causally consistent sessions

Author: kay-kim

config/sphinx_local.yaml

@@ -25,6 +25,7 @@ theme:
     - /core/authentication
     - /core/authorization
     - /core/backups
+    - /core/read-isolation-consistency-recency
     - /core/databases-and-collections
     - /core/geohaystack
     - /core/index-single