More newlines for improved readability (#1880)

* Add blank lines above all `fn`, `impl`, `struct`, etc
* Even newlines between docstringed struct and enum fields
* Improve some documentation

egui-wgpu/src/lib.rs

@@ -15,5 +15,6 @@ pub use renderer::CallbackFn;
 /// Module for painting [`egui`] with [`wgpu`] on [`winit`].
 #[cfg(feature = "winit")]
 pub mod winit;
+
 #[cfg(feature = "winit")]
 pub use crate::winit::RenderState;

egui-wgpu/src/renderer.rs

@@ -33,6 +33,7 @@ pub struct CallbackFn {
 }
 
 type PrepareCallback = dyn Fn(&wgpu::Device, &wgpu::Queue, &mut TypeMap) + Sync + Send;
+
 type PaintCallback =
     dyn for<'a, 'b> Fn(PaintCallbackInfo, &'a mut wgpu::RenderPass<'b>, &'b TypeMap) + Sync + Send;