Delete bad WPF themes link

[gewarren]

Fixes #821.

[opbld34]

Docs Build status updates of commit 38308cd:

✅ Validation status: passed

File	Status	Preview URL	Details
xml/System.Windows.Controls.Primitives/DatePickerTextBox.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/RepeatButton.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/ScrollBar.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/StatusBar.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/StatusBarItem.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/Thumb.xml	✅Succeeded	View
xml/System.Windows.Controls.Primitives/ToggleButton.xml	✅Succeeded	View
xml/System.Windows.Controls/Button.xml	✅Succeeded	View
xml/System.Windows.Controls/Calendar.xml	✅Succeeded	View
xml/System.Windows.Controls/CheckBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ComboBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ComboBoxItem.xml	✅Succeeded	View
xml/System.Windows.Controls/ContentControl.xml	✅Succeeded	View
xml/System.Windows.Controls/ContextMenu.xml	✅Succeeded	View
xml/System.Windows.Controls/DataGrid.xml	✅Succeeded	View
xml/System.Windows.Controls/DatePicker.xml	✅Succeeded	View
xml/System.Windows.Controls/DocumentViewer.xml	✅Succeeded	View
xml/System.Windows.Controls/Expander.xml	✅Succeeded	View
xml/System.Windows.Controls/Frame.xml	✅Succeeded	View
xml/System.Windows.Controls/GridSplitter.xml	✅Succeeded	View
xml/System.Windows.Controls/GroupBox.xml	✅Succeeded	View
xml/System.Windows.Controls/GroupItem.xml	✅Succeeded	View
xml/System.Windows.Controls/HeaderedContentControl.xml	✅Succeeded	View
xml/System.Windows.Controls/HeaderedItemsControl.xml	✅Succeeded	View
xml/System.Windows.Controls/ItemsControl.xml	✅Succeeded	View
xml/System.Windows.Controls/Label.xml	✅Succeeded	View
xml/System.Windows.Controls/ListBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ListBoxItem.xml	✅Succeeded	View
xml/System.Windows.Controls/ListView.xml	✅Succeeded	View
xml/System.Windows.Controls/ListViewItem.xml	✅Succeeded	View
xml/System.Windows.Controls/Menu.xml	✅Succeeded	View
xml/System.Windows.Controls/MenuItem.xml	✅Succeeded	View
xml/System.Windows.Controls/Page.xml	✅Succeeded	View
xml/System.Windows.Controls/PasswordBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ProgressBar.xml	✅Succeeded	View
xml/System.Windows.Controls/RadioButton.xml	✅Succeeded	View
xml/System.Windows.Controls/RichTextBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ScrollViewer.xml	✅Succeeded	View
xml/System.Windows.Controls/Separator.xml	✅Succeeded	View
xml/System.Windows.Controls/Slider.xml	✅Succeeded	View
xml/System.Windows.Controls/TabControl.xml	✅Succeeded	View
xml/System.Windows.Controls/TabItem.xml	✅Succeeded	View
xml/System.Windows.Controls/TextBox.xml	✅Succeeded	View
xml/System.Windows.Controls/ToolBar.xml	✅Succeeded	View
xml/System.Windows.Controls/ToolTip.xml	✅Succeeded	View
xml/System.Windows.Controls/TreeView.xml	✅Succeeded	View
xml/System.Windows.Controls/TreeViewItem.xml	✅Succeeded	View
xml/System.Windows.Controls/UserControl.xml	✅Succeeded	View
xml/System.Windows.Documents/Hyperlink.xml	✅Succeeded	View
xml/System.Windows.Media/Geometry.xml	✅Succeeded	View

This comment lists only the first 50 files in the pull request.
For more details, please refer to the build report.

Note: Broken links written as relative paths are included in the above build report. For broken links written as absolute paths or external URLs, see the broken link report.

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[BillWagner]

Thanks @gewarren

This LGTM.

Let's