docs: Remove unnecessary comment marks from the Makefile help section (#21749)

**Previous screenshot:**
<img width="758" alt="image"
src="https://github.com/langchain-ai/langchain/assets/1683919/7b90626e-35ab-4486-b41d-b664e69eec0b">

**Current:**
<img width="744" alt="image"
src="https://github.com/langchain-ai/langchain/assets/1683919/cdb69512-dc6c-4b7f-a466-4be92d94c076">
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laishzh 2024-05-17 00:05:44 +08:00 committed by GitHub
parent e44b448ec3
commit c03fd93fc1
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