Harrison/human in the loop (#776)

* add human in the loop examples

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docs/mkdocs.yml

@@ -140,8 +140,10 @@ nav:
          - Create map-reduce branches for parallel execution: how-tos/map-reduce.ipynb
      - Human-in-the-loop:
          - Add persistence ("memory"): how-tos/persistence.ipynb
-         - View and update graph state: how-tos/time-travel.ipynb
-         - Add human-in-the-loop: how-tos/human-in-the-loop.ipynb
+         - Add breakpoints: how-tos/human_in_the_loop/breakpoints.ipynb
+         - Wait for user input: how-tos/human_in_the_loop/wait-user-input.ipynb
+         - View and update past graph state: how-tos/human_in_the_loop/time-travel.ipynb
+         - Edit graph state: how-tos/human_in_the_loop/edit-graph-state.ipynb
      - Streaming:
          - Stream LLM tokens: how-tos/streaming-tokens.ipynb
          - Stream Arbitrarily Nested Content: how-tos/streaming-content.ipynb