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DOCS: added missing imports (#13736) (#13737)

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- **Description:** Fixed missing imports in docs 
- **Issue:**
[#13736](https://github.com/langchain-ai/langchain/issues/13736)
- **Dependencies:** N/A
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Piotr Ząbek 2023-11-29 04:42:43 +01:00 committed by GitHub
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docs/docs/modules/model_io/prompts/prompt_templates/msg_prompt_templates.mdx
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@ -27,6 +27,8 @@ LangChain also provides `MessagesPlaceholder`, which gives you full control of w
```python
from langchain.prompts import MessagesPlaceholder
from langchain.prompts import HumanMessagePromptTemplate
from langchain.prompts import ChatPromptTemplate
human_prompt = "Summarize our conversation so far in {word_count} words."
human_message_template = HumanMessagePromptTemplate.from_template(human_prompt)
@ -36,6 +38,8 @@ chat_prompt = ChatPromptTemplate.from_messages([MessagesPlaceholder(variable_nam
```python
from langchain.schema.messages import HumanMessage, AIMessage
human_message = HumanMessage(content="What is the best way to learn programming?")
ai_message = AIMessage(content="""\
1. Choose a programming language: Decide on a programming language that you want to learn.