Update SharePointReferenceToc.xml

Author: davidchesnut

misc/SharePointReferenceToc.xml

@@ -3,7 +3,7 @@
 	<Item text="SharePoint Framework Reference" url="spdx" SEODescription="Reference documentation for the SharePoint Framework">
 		<Item text="Internal modules" url="spfx/internal-modules" SEODescription=""/>
 		<Item text="sp-webpart-base" url="spfx/sp-webpart-base-module" SEODescription="">
-			<Item text="Classes" url="spfx/sp-webpart-base" SEODescription="">
+			<Item text="Classes" url="spfx/sp-webpart-base/class" SEODescription="">
 				<Item text="BaseClientSideWebPart" url="spfx/sp-webpart-base/class/baseclientsidewebpart" SEODescription=""/>
 			</Item>
 			<Item text="Enumerations" url="spfx/sp-webpart-base" SEODescription="">