docs: clarify array entry behavior with examples #7767
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| **Why?** In a multi-page application, the server is going to fetch a new HTML document for you. The page reloads this new document and assets are redownloaded. However, this gives us the unique opportunity to do things like using [`optimization.splitChunks`](/configuration/optimization/#optimizationsplitchunks) to create bundles of shared application code between each page. Multi-page applications that reuse a lot of code/modules between entry points can greatly benefit from these techniques, as the number of entry points increases. | ||
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| T> As a rule of thumb: Use exactly one entry point for each HTML document. See the issue [described here](https://bundlers.tooling.report/code-splitting/multi-entry/#webpack) for more details. | ||
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This PR improves the documentation for array entry usage by explaining
that it creates a single entry chunk and by adding common real-world
examples such as polyfills and development-only scripts.
Fixes #3788