Separated list_agents() from session management (#4111)

### What problem does this PR solve?


### Type of change

- [x] Documentation Update

docs/references/python_api_reference.md

@@ -1139,7 +1139,7 @@ for assistant in rag_object.list_chats():
 
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-## CHAT SESSIONS
+## SESSION MANAGEMENT
 
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@@ -1576,6 +1576,10 @@ for session in sessions:
 
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+## AGENT MANAGEMENT
+
+---
+
 ### List agents
 
 ```python