Fixed ThemeModeConverter docs

Author: dipeshmsft

xml/System.Windows/ThemeModeConverter.xml

@@ -120,9 +120,9 @@
       <Docs>
         <param name="typeDescriptorContext">The ITypeDescriptorContext for this call.</param>
         <param name="cultureInfo">The CultureInfo which is respected when converting.</param>
-        <param name="source">The object to convert to a ThemeMode.</param>
-        <summary>Attempts to convert to a ThemeMode from the specified object</summary>
-        <returns>The new ThemeMode instance.</returns>
+        <param name="source">The object to convert to a <see cref="T:System.Windows.ThemeMode" />.</param>
+        <summary>Attempts to convert to a <see cref="T:System.Windows.ThemeMode" /> from the specified object</summary>
+        <returns>The new <see cref="T:System.Windows.ThemeMode" /> instance.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.ArgumentNullException">The example object is <see langword="null" />.</exception>
       </Docs>
@@ -151,15 +151,15 @@
       <Docs>
         <param name="typeDescriptorContext">The ITypeDescriptorContext for this call.</param>
         <param name="cultureInfo">The CultureInfo which is respected when converting.</param>
-        <param name="value">The ThemeMode to convert.</param>
+        <param name="value">The <see cref="T:System.Windows.ThemeMode" /> to convert.</param>
         <param name="destinationType">The type to which to convert the ThemeMode instance.</param>
-        <summary>Attempts to convert a ThemeMode object to the specified type.</summary>
+        <summary>Attempts to convert a <see cref="T:System.Windows.ThemeMode" /> object to the specified type.</summary>
         <returns>The newly constructed object.</returns>
         <remarks>To be added.</remarks>
         <exception cref="T:System.ArgumentNullException">
           <paramref name="value" />  is <see langword="null" />.</exception>
-        <exception cref="T:System.ArgumentException">
-          <paramref name="value" /> is not a ThemeMode, or <paramref name="destinationType" /> isn't a valid destination type.</exception>
+        <exception cref="T:System.NotSupportedException">
+          <paramref name="value" /> is <see langword="null" /> or not a <see cref="T:System.Windows.ThemeMode" />, or <paramref name="destinationType" /> isn't a valid destination type.</exception>
       </Docs>
     </Member>
   </Members>