Update llm.md

docs/llm.md

@@ -91,6 +91,6 @@ def call_llm(prompt):
 
 ## Why Not Provide Built-in LLM Wrappers?
 I believe it is a **bad practice** to provide LLM-specific implementations in a general framework:
-- **LLM APIs change frequently**. Hardcoding them makes maintenance a nighmare.
+- **LLM APIs change frequently**. Hardcoding them makes maintenance a nightmare.
 - You may need **flexibility** to switch vendors, use fine-tuned models, or deploy local LLMs.
 - You may need **optimizations** like prompt caching, request batching, or response streaming.