[langgraph]: Document subgraph as a function call, soft hide subgraph as a node #551
Description
Type of issue
Clarification, better guidelines
Language
Python
Description
The documentation should encourage users to invoke subgraphs as functions rather than including them as a node.
Using subgraphs as a node has some gotchyas (state encapsulation) and it's not the default thing that users should be doing. We can explain the behavior, but by default the examples should be using function calls.