Reword file list as *.cpp *.h (#4413)

docs/README.md

@@ -27,7 +27,7 @@ Dear ImGui is particularly suited to integration in games engine (for tooling),
 
 ### Usage
 
-**The core of Dear ImGui is self-contained within a few platform-agnostic files** which you can easily compile in your application/engine. They are all the files in the root folder of the repository (imgui.cpp, imgui.h, imgui_demo.cpp, imgui_draw.cpp etc.).
+**The core of Dear ImGui is self-contained within a few platform-agnostic files** which you can easily compile in your application/engine. They are all the files in the root folder of the repository (imgui*.cpp, imgui*.h).
 
 **No specific build process is required**. You can add the .cpp files to your existing project.