docs: remove broken build.license example (#21073)

Author: btea

docs/config/build-options.md

@@ -212,25 +212,6 @@ If `fileName` is passed, it will be used as the license file name relative to th
 ]
 ```
 
-::: tip
-If you'd like to reference the license file in the built code, you can use `build.rollupOptions.output.banner` to inject a comment at the top of the files. For example:
-
-```js twoslash [vite.config.js]
-import { defineConfig } from 'vite'
-
-export default defineConfig({
-  build: {
-    license: true,
-    rollupOptions: {
-      output: {
-        banner:
-          '/* See licenses of bundled dependencies at https://example.com/license.md */',
-      },
-    },
-  },
-})
-```
-
 :::
 
 ## build.manifest