Rename example file scaling.rs to ui_scaling.rs (bevyengine#6296)

# Objective

To be consistent like other examples, it's better to keep file name and example name same, so we don't need to find correct example name in Cargo.toml.

## Solution

Rename example file scaling.rs to ui_scaling.rs.

Author: lewiszlw

Cargo.toml

@@ -1474,7 +1474,7 @@ wasm = true
 
 [[example]]
 name = "ui_scaling"
-path = "examples/ui/scaling.rs"
+path = "examples/ui/ui_scaling.rs"
 
 [package.metadata.example.ui_scaling]
 name = "UI Scaling"

examples/README.md

@@ -315,7 +315,7 @@ Example | Description
 [Text Debug](../examples/ui/text_debug.rs) | An example for debugging text layout
 [Transparency UI](../examples/ui/transparency_ui.rs) | Demonstrates transparency for UI
 [UI](../examples/ui/ui.rs) | Illustrates various features of Bevy UI
-[UI Scaling](../examples/ui/scaling.rs) | Illustrates how to scale the UI
+[UI Scaling](../examples/ui/ui_scaling.rs) | Illustrates how to scale the UI
 
 ## Window