Update timestamp in front matter & markdown formatting for property

Author: andrewconnell

docs/spfx/publish-to-marketplace-checklist.md

@@ -1,7 +1,7 @@
 ---
 title: Prepare your SharePoint Framework application for publishing to the Marketplace
 description: Tips & tricks to help you get your SharePoint Framework application published in the Marketplace
-ms.date: 07/21/2020
+ms.date: 07/31/2020
 ms.prod: sharepoint
 localization_priority: Priority
 ---
@@ -33,7 +33,7 @@ Following checks must be passed. If one or more checks from this category failed
 
 ### Ensure SharePoint Framework Contract Conformance
 
-Your webpart or customizer must only manipulate the DOM element provided through the "domElement" property. This element and the provided context object are the only approved ways to add functionality into sites through your app. Directly manipulating the page DOM will result in rejection of your solution.
+Your webpart or customizer must only manipulate the DOM element provided through the `domElement` property. This element and the provided context object are the only approved ways to add functionality into sites through your app. Directly manipulating the page DOM will result in rejection of your solution.
 
 ### Under normal circumstances solution should work as intended