added new toc entry

Author: davidchesnut

misc/SharePointReferenceToc.xml

@@ -1,7 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 <Menu xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema" SupportedProduct="|SharePoint" SupportedVersion="|V1.0|">
 	<Item text="SharePoint Framework Reference" url="spfx" SEODescription="Reference documentation for the SharePoint Framework">
-	
+	<Item text="Overview" url="spfx/sharepoint-framework-reference-overview" SEODescription="Reference documentation for the SharePoint Framework"/>
 		<Item text="sp-webpart-base" url="spfx/sp-webpart-base-module" SEODescription="">
 			<Item text="Classes" url="spfx/sp-webpart-base/class" SEODescription="">
 				<Item text="BaseClientSideWebPart" url="spfx/sp-webpart-base/class/baseclientsidewebpart" SEODescription=""/>
@@ -134,7 +134,6 @@
 				<Item text="SPWeb" url="spfx/sp-page-context/class/spweb" SEODescription=""/>
 			</Item>
 		</Item>
-		
 		<Item text="horizontalline" url="/" IsSeparation="true" />
 		<Item text="External packages" url="spfx/external-packages" SEODescription=""/>
 		<Item text="es6-collections" url="spfx/es6-collections-module" SEODescription="">