examples/custom-renderer: cleanup docs

Signed-off-by: Stephen Gutekanst <stephen@hexops.com>

examples/custom-renderer/main.zig

@@ -1,11 +1,9 @@
-// Experimental ECS app example. Not yet ready for actual use.
 const mach = @import("mach");
 
 const Renderer = @import("Renderer.zig");
 const Game = @import("Game.zig");
 
-// The list of modules to be used in our application. Our game itself is implemented in our own
-// module called Game.
+// The global list of Mach modules registered for use in our application.
 pub const modules = .{
     mach.Engine,
     Renderer,