README.md: minor updates

README.md

@@ -6,10 +6,10 @@ This is the Simple DirectMedia Layer, a general API that provides low
 level access to audio, keyboard, mouse, joystick, 3D hardware via OpenGL,
 and 2D framebuffer across multiple platforms.
 
-This code is a compatibility layer; it provides a binary-compatible API for
-programs written against SDL 1.2, but it uses SDL 2.0 behind the scenes. If
-you are writing new code, please target SDL 2.0 directly and do not use this
-layer.
+This code is a compatibility layer; it provides a binary and source
+compatible API for programs written against SDL 1.2, but it uses SDL 2.0
+behind the scenes. If you are writing new code, please target SDL 2.0
+directly and do not use this layer.
 
 If you absolutely must have the real SDL 1.2 ("SDL 1.2 Classic"), please use
 the source tree at https://github.com/libsdl-org/SDL-1.2, which occasionally
@@ -18,8 +18,8 @@ that.
 
 # How to use:
 
-- Build the library. This will need access to SDL2's headers, CMake
-( https://cmake.org/ ) and the build tools of your choice. Once built, you
+- Build the library. This will need access to SDL2's headers,
+[CMake](https://cmake.org/) and the build tools of your choice. Once built, you
 will have a drop-in replacement that can be used with any existing binary
 that relies on SDL 1.2. You can copy this library over the existing 1.2 build,
 or force it to take priority over a system copy with LD_LIBRARY_PATH, etc.