MC-2371: Implement full width layout for CMS pages

- Add comment to explain layout changes

Author: davemacaulay

app/code/Magento/PageBuilder/view/frontend/page_layout/cms-full-width.xml

@@ -7,5 +7,7 @@
 -->
 <layout xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:View/Layout/etc/page_layout.xsd">
     <update handle="1column" />
+
+    <!-- Remove page-main class and replace it with page-main-full-width to remove page gutters -->
     <referenceContainer name="main.content" htmlTag="main" htmlClass="page-main-full-width" />
 </layout>