Resolves issue DOC: Incorrect and confusing documentation of AIMessag… (#10379)

Resolves issue DOC: Incorrect and confusing documentation of
AIMessagePromptTemplate and HumanMessagePromptTemplate #10378

- Description: Revised docstrings to correctly and clearly document each
PromptTemplate
- Issue: #10378
- Dependencies: N/A
- Tag maintainer: @baskaryan

---------

Co-authored-by: Bagatur <baskaryan@gmail.com>

libs/langchain/langchain/prompts/chat.py

@@ -229,7 +229,7 @@ class ChatMessagePromptTemplate(BaseStringMessagePromptTemplate):
 
 
 class HumanMessagePromptTemplate(BaseStringMessagePromptTemplate):
-    """Human message prompt template. This is a message that is sent to the user."""
+    """Human message prompt template. This is a message sent from the user."""
 
     def format(self, **kwargs: Any) -> BaseMessage:
         """Format the prompt template.
@@ -245,7 +245,7 @@ class HumanMessagePromptTemplate(BaseStringMessagePromptTemplate):
 
 
 class AIMessagePromptTemplate(BaseStringMessagePromptTemplate):
-    """AI message prompt template. This is a message that is not sent to the user."""
+    """AI message prompt template. This is a message sent from the AI."""
 
     def format(self, **kwargs: Any) -> BaseMessage:
         """Format the prompt template.