Removed physical_size

docs/beginner/tutorial2-swapchain/README.md

@@ -118,7 +118,6 @@ If we want to support resizing in our application, we're going to need to recrea
 ```rust
 // impl State
 fn resize(&mut self, new_size: winit::dpi::PhysicalSize<u32>) {
-    let physical_size = new_size.to_physical(self.hidpi_factor);
     self.size = new_size;
     self.sc_desc.width = new_size.width;
     self.sc_desc.height = new_size.height;
@@ -337,4 +336,4 @@ In the event loop we're currently using `*control_flow = ControlFlow::Wait` in m
 
 Modify the `input()` method to capture mouse events, and update the clear color using that. *Hint: you'll probably need to use `WindowEvent::CursorMoved`*
 
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