put copied() after find() to avoid unnecessary copying of all the traversed items and instead copy only the one found

docs/beginner/tutorial2-surface/README.md

@@ -161,8 +161,8 @@ The `limits` field describes the limit of certain types of resources that we can
         // one will result in all the colors coming out darker. If you want to support non
         // sRGB surfaces, you'll need to account for that when drawing to the frame.
         let surface_format = surface_caps.formats.iter()
-            .copied()
             .find(|f| f.is_srgb())
+            .copied()
             .unwrap_or(surface_caps.formats[0]);
         let config = wgpu::SurfaceConfiguration {
             usage: wgpu::TextureUsages::RENDER_ATTACHMENT,