Update lazy-loading.md

[LuisRodNuezDev]

I had to add the CleanWebpackPlugin and the HtmlWebpackPlugin in the webpack.config.js file in order to get the same results that were shown in the example after the npm run build command was ran. These two plugins were not present in the Code Splitting subsection of the Guides section.

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[chenxsan]

I think the situation here is a little complex. That Lazy Loading guide was based on Code Splitting guide which was based on others, and those plugins are presented over there. Which means you have to finish other guides before Lazy Loading, otherwise you might get a problem.

I have a plan to refactor the guides so they're not deeply coupled. Hope it can save us from those problems in future.

[LuisRodNuezDev]

Thank you for your help. I will keep this in mind when going through other guides in the future.