blog: refine introduction and update section titles for Webpack 5.106

Author: bjohansebas

src/content/blog/2026-03-22-webpack-5-106.mdx

@@ -5,7 +5,9 @@ contributors:
   - bjohansebas
 ---
 
-Webpack 5.106 introduces plugin validation hooks, runtime style injection for CSS Modules, improved tree shaking for CommonJS, and experimental support for alternative JavaScript parsers.
+**Webpack 5.106 introduces plugin validation hooks, built-in runtime style injection for CSS Modules, smarter tree shaking for CommonJS destructuring, and an experimental integration with `oxc-parser` for faster JavaScript parsing.**
+
+Explore what's new in this release:
 
 - [Plugin Validation with `compiler.hooks.validate`](#plugin-validation-with-compilerhooksvalidate)
 - [CSS Modules with Runtime Style Injection](#css-modules-with-runtime-style-injection)