Apply suggestions from code review

Co-Authored-By: m-green <mark.green@digital.cabinet-office.gov.uk>

CHANGELOG.md

@@ -300,9 +300,9 @@ You can now add attributes like classes, rowspan and colspan to table row header
 
 ### Use page wrapper auto spacing
 
-You can now use the the `.govuk-main-wrapper--auto-spacing` modifier on the main wrapper.
+You can now add the `.govuk-main-wrapper--auto-spacing` modifier class to your `<main>` element to add responsive padding to the top and bottom of the page.
 
-This will apply the correct spacing depending on whether there are any elements (such the back link, breadcrumbs or phase banner components) before the `.govuk-main-wrapper` in the `.govuk-width-container`.
+This will add the correct amount of padding depending on whether there are elements above the `<main>` element inside the `govuk-width-container` wrapper, like the back link, breadcrumbs or phase banner components.
 
 If you need to control the spacing manually, use the `.govuk-main-wrapper--l` modifier instead.