Correct README for model filename consistency

- Corrected README for model quantized model filenames with instructions.

README.md

@@ -64,7 +64,7 @@ huggingface-cli download gorilla-llm/gorilla-openfunctions-v2-gguf gorilla-openf
 
 It will store the QUANTIZATION_METHOD GGUF file to your local directory, `gorilla-openfunctions-v2-GGUF`.
 
-We support QUANTIZATION_METHOD = {`q2_K`, `q3K_S`, `q3K_M`, `q3K_L`, `q4K_S`, `q4K_M`, `q5K_S`, `q5K_M`, `q6K`}. 
+We support QUANTIZATION_METHOD = {`q2_K`, `q3_K_S`, `q3_K_M`, `q3_K_L`, `q4_K_S`, `q4_K_M`, `q5_K_S`, `q5_K_M`, `q6_K`}. 
 Please let us know what other quantization methods you would like us to include!
 
 Please follow the [llama-cpp-python](https://github.com/abetlen/llama-cpp-python) for `llama-cpp-python` package installation on your machine.