chore: add document for model vs engine

Author: nguyenhoangthuan99

docs/docs/capabilities/models/index.mdx

@@ -7,6 +7,10 @@ description: The Model section overview
 🚧 Cortex.cpp is currently under development. Our documentation outlines the intended behavior of Cortex, which may not yet be fully implemented in the codebase.
 :::
 
+Models in cortex.cpp are used for inference purposes (e.g., chat completion, embedding, etc.). We support two types of models: local and remote.
+Local models use a local inference engine to run completely offline on your hardware. Currently, we support llama.cpp with the GGUF model format, and we have plans to support TensorRT-LLM and ONNX engines in the future.
+Remote models (like OpenAI GPT-4 and Claude 3.5 Sonnet) use remote engines. Support for OpenAI and Anthropic engines is under development and will be available in cortex.cpp soon.
+
 When Cortex.cpp is started, it automatically starts an API server, this is inspired by Docker CLI. This server manages various model endpoints. These endpoints facilitate the following:
 - **Model Operations**: Run and stop models.
 - **Model Management**: Manage your local models.

docs/docs/guides/function-calling.md

@@ -1,10 +1,9 @@
 ---
 title: Function Calling
 ---
-
 # Function calling with OpenAI compatible
 
-This tutorial, I use the `mistral-nemo:12b-gguf-q4-km` for testing with cortex.cpp. All steps are reproduced from original openai instruction https://platform.openai.com/docs/guides/function-calling
+This tutorial, I use the `mistral-nemo:12b-gguf-q4-km` for testing function calling with cortex.cpp. All steps are reproduced from original openai instruction https://platform.openai.com/docs/guides/function-calling
 
 ## Step by step with function calling
 
@@ -113,7 +112,7 @@ completion_payload = {
     "messages": [
         {"role": "system", "content": "You are a helpful customer support assistant. Use the supplied tools to assist the user."},
         {"role": "user", "content": "Hi, can you tell me the delivery date for my order?"},
-        {"role": "assistant", "content": "Sure! Could you please provide your order ID so I can look up the delivery date for you?"},
+        {"role": "assistant", "content": "Of course! Please provide your order ID so I can look it up."},
         {"role": "user", "content": "i think it is order_12345"},
     ]
 }