Fix typo: propert pages -> property pages (#5477)

Author: changeworld

docs/mfc/property-sheets-and-property-pages-mfc.md

@@ -2,7 +2,7 @@
 description: "Learn more about: Property Sheets and Property Pages (MFC)"
 title: "Property Sheets and Property Pages (MFC)"
 ms.date: "11/04/2016"
-helpviewer_keywords: ["MFC dialog boxes [MFC], tabs", "property pages [MFC], property sheets", "CPropertyPage class [MFC], property sheets and pages", "CPropertySheet class [MFC], property sheets and pages", "property sheets, propert pages"]
+helpviewer_keywords: ["MFC dialog boxes [MFC], tabs", "property pages [MFC], property sheets", "CPropertyPage class [MFC], property sheets and pages", "CPropertySheet class [MFC], property sheets and pages", "property sheets, property pages"]
 ms.assetid: de8fea12-6c35-4cef-8625-b8073a379446
 ---
 # Property Sheets and Property Pages (MFC)