docs: polish migration wordings (#7117)

website/docs/en/blog/announcing-0-6.mdx

@@ -141,7 +141,7 @@ module.exports = {
 };
 ```
 
-### Migrate builtins.css
+### Migrate from builtins.css
 
 1. Use `module.parser["css/auto"].namedExports` to replace `builtins.css.namedExports`.
 2. Use `module.generator["css/auto"].exportsOnly` to replace `builtins.css.modules.exportsOnly`.

website/docs/en/guide/migration/cra.mdx

@@ -1,4 +1,4 @@
-# Migrate Create React App
+# Migrate from Create React App
 
 Because Create React App (CRA) itself has many built-in capabilities, manually setting up an equivalent configuration using `@rspack/cli` can be challenging. Therefore, we recommend migrating CRA applications to [Rsbuild](https://rsbuild.dev/) to leverage Rspack's capabilities.
 

website/docs/en/guide/migration/storybook.mdx

@@ -1,6 +1,6 @@
 import { PackageManagerTabs } from '@theme';
 
-# Migrating Storybook
+# Migrate from Storybook webpack
 
 If you are using React / Vue with [Storybook](https://storybook.js.org/) and building with webpack 5, you can replace the `@storybook/react-webpack5` build with [storybook-rsbuild](https://github.com/rspack-contrib/storybook-rsbuild), which is implemented based on Rsbuild and uses Rspack as the underlying bundler. It supports out-of-the-box use, and the documentation can be found at [storybook-rsbuild](https://github.com/rspack-contrib/storybook-rsbuild).
 

website/docs/en/guide/migration/webpack.mdx

@@ -1,6 +1,6 @@
 import { PackageManagerTabs } from '@theme';
 
-# Migrate webpack
+# Migrate from webpack
 
 Rspack's configuration is designed based on webpack, enabling you to migrate your project from webpack to Rspack with ease.