Update agent type docs (#11137)

In code docs for agent types

libs/langchain/langchain/agents/agent_types.py

@@ -1,17 +1,47 @@
+"""Module definitions of agent types together with corresponding agents."""
 from enum import Enum
 
 
 class AgentType(str, Enum):
-    """Enumerator with the Agent types."""
+    """An enum for agent types.
+
+    See documentation: https://python.langchain.com/docs/modules/agents/agent_types/
+    """
 
     ZERO_SHOT_REACT_DESCRIPTION = "zero-shot-react-description"
+    """A zero shot agent that does a reasoning step before acting."""
+
     REACT_DOCSTORE = "react-docstore"
+    """A zero shot agent that does a reasoning step before acting.
+    
+    This agent has access to a document store that allows it to look up 
+    relevant information to answering the question.
+    """
+
     SELF_ASK_WITH_SEARCH = "self-ask-with-search"
+    """An agent that breaks down a complex question into a series of simpler questions.
+    
+    This agent uses a search tool to look up answers to the simpler questions
+    in order to answer the original complex question.
+    """
     CONVERSATIONAL_REACT_DESCRIPTION = "conversational-react-description"
     CHAT_ZERO_SHOT_REACT_DESCRIPTION = "chat-zero-shot-react-description"
+    """A zero shot agent that does a reasoning step before acting.
+    
+    This agent is designed to be used in conjunction 
+    """
+
     CHAT_CONVERSATIONAL_REACT_DESCRIPTION = "chat-conversational-react-description"
+
     STRUCTURED_CHAT_ZERO_SHOT_REACT_DESCRIPTION = (
         "structured-chat-zero-shot-react-description"
     )
+    """An zero-shot react agent optimized for chat models.
+    
+    This agent is capable of invoking tools that have multiple inputs.
+    """
+
     OPENAI_FUNCTIONS = "openai-functions"
+    """An agent optimized for using open AI functions."""
+
     OPENAI_MULTI_FUNCTIONS = "openai-multi-functions"