Merge pull request #1792 from langchain-ai/nc/21sep/docstrings-comments

Add more comments and docstrings

docs/docs/reference/graphs.md

@@ -29,7 +29,7 @@ handler: python
 
 ## StreamMode
 
-::: langgraph.pregel.StreamMode
+::: langgraph.types.StreamMode
 
 ## Constants
 
@@ -69,8 +69,12 @@ builder.add_conditional_edges("my_node", my_condition)
 
 ## Send
 
-::: langgraph.constants.Send
+::: langgraph.types.Send
+
+## Interrupt
+
+::: langgraph.types.Interrupt
 
 ## RetryPolicy
 
-::: langgraph.pregel.types.RetryPolicy
+::: langgraph.types.RetryPolicy