[Docs] Minor fix (#162)

README.md

@@ -22,7 +22,7 @@ Easy, fast, and cheap LLM serving for everyone
 
 ---
 
-vLLM is a fast and easy to use library for LLM inference and serving.
+vLLM is a fast and easy-to-use library for LLM inference and serving.
 
 vLLM is fast with:
 

docs/source/index.rst

@@ -22,7 +22,7 @@ Welcome to vLLM!
 
 
 
-vLLM is a fast and easy to use library for LLM inference and serving.
+vLLM is a fast and easy-to-use library for LLM inference and serving.
 
 vLLM is fast with: