Update wording in SiteMapDataSource.xml (#3345)

The site reads, "an SiteMapProvider object ..." It should read, "a SiteMapProvider object ..."

Author: BrownCasey

xml/System.Web.UI.WebControls/SiteMapDataSource.xml

@@ -76,7 +76,7 @@
   
 <a name="retrieving_site_map_data"></a>   
 ## Retrieving Site Map Data  
- Site map data is retrieved from an <xref:System.Web.SiteMapProvider> object, such as <xref:System.Web.XmlSiteMapProvider>, which is the default site map provider for ASP.NET. You can specify any provider that is configured for your site to provide the site map data to the <xref:System.Web.UI.WebControls.SiteMapDataSource> and can obtain the list of available providers by accessing the <xref:System.Web.SiteMap.Providers%2A?displayProperty=nameWithType> collection.  
+ Site map data is retrieved from a <xref:System.Web.SiteMapProvider> object, such as <xref:System.Web.XmlSiteMapProvider>, which is the default site map provider for ASP.NET. You can specify any provider that is configured for your site to provide the site map data to the <xref:System.Web.UI.WebControls.SiteMapDataSource> and can obtain the list of available providers by accessing the <xref:System.Web.SiteMap.Providers%2A?displayProperty=nameWithType> collection.  
   
  Like all data source controls, every instance of a <xref:System.Web.UI.WebControls.SiteMapDataSource> is associated with a single helper object, known as a data source view. The <xref:System.Web.UI.WebControls.SiteMapDataSourceView> is a view on the site map data, according to the properties of the data source, and is retrieved by calling the <xref:System.Web.UI.WebControls.SiteMapDataSource.GetHierarchicalView%2A> method. The <xref:System.Web.UI.WebControls.SiteMapDataSourceView> maintains the <xref:System.Web.SiteMapNodeCollection> object that the controls bind to.