docs: clean up memory docs (#2000)

docs/mkdocs.yml

@@ -136,14 +136,15 @@ nav:
           - Create map-reduce branches for parallel execution: how-tos/map-reduce.ipynb
           - Control graph recursion limit: how-tos/recursion-limit.ipynb
       - Persistence:
-          - Add persistence ("memory"): how-tos/persistence.ipynb
-          - Manage conversation history: how-tos/memory/manage-conversation-history.ipynb
-          - Delete messages: how-tos/memory/delete-messages.ipynb
-          - Add summary of the conversation history: how-tos/memory/add-summary-conversation-history.ipynb
-          - Share state between threads: how-tos/memory/shared-state.ipynb
+          - Add thread-level persistence: how-tos/persistence.ipynb
+          - Add cross-thread persistence: how-tos/cross-thread-persistence.ipynb
           - Use Postgres checkpointer for persistence: how-tos/persistence_postgres.ipynb
           - Create custom checkpointer using MongoDB: how-tos/persistence_mongodb.ipynb
           - Create custom checkpointer using Redis: how-tos/persistence_redis.ipynb
+      - Memory:
+          - Manage conversation history: how-tos/memory/manage-conversation-history.ipynb
+          - Delete messages: how-tos/memory/delete-messages.ipynb
+          - Add summary of the conversation history: how-tos/memory/add-summary-conversation-history.ipynb
       - Human-in-the-loop:
           - Add breakpoints: how-tos/human_in_the_loop/breakpoints.ipynb
           - Add dynamic breakpoints: how-tos/human_in_the_loop/dynamic_breakpoints.ipynb