Update docs/source/contributing/style-guide.md

Co-authored-by: Steve Piercy <[email protected]>

docs/source/contributing/style-guide.md

@@ -27,7 +27,8 @@ As mentioned earlier, design systems evolve over time based on user feedback and
 ## Tooling around a design system
 
 Volto adopted some time ago [Storybook](https://storybook.js.org), a tool that interactively displays the visual elements of a design system.
-Storybook provides a sandbox to build and test these visual elements (components) in isolation, mock them to show different data and test edge cases and at the same time document them, on how to instantiate them and use them for the developers' own benefit.
+Storybook provides a sandbox to build and test these visual elements (components) in isolation, mock them to show different data, and test edge cases.
+At the same time, Storybook documents components for how to instantiate them and use them in development.
 
 Not all Volto's visual components are covered yet in Storybook, but it has already a good foundation.
 Look at the current components [Storybook build](https://6.docs.plone.org/storybook).