update headers

Author: edmundhung

src/content/changelog/workers/2025-08-19-improved-wrangler-error-screen.mdx

@@ -10,8 +10,8 @@ Wrangler's error screen has received several improvements to enhance your debugg
 
 The error screen now features a refreshed design with support for both light and dark themes, improved source map resolution logic that handles missing source files more reliably, and better error cause display.
 
-| Old         | New (Light Theme) | New (Dark Theme) |
-|-------------|-------------------|------------------|
+| Before | After (Light) | After (Dark) |
+|--------|---------------|--------------|
 | ![Old error screen](../../../assets/images/workers/changelog/old-error-screen.png) | ![New light theme error screen](../../../assets/images/workers/changelog/new-error-screen-light.png) | ![New dark theme error screen](../../../assets/images/workers/changelog/new-error-screen-dark.png) |
 
 Try it out now with `npx wrangler@latest dev` in your Workers project.