Fix description of ValueSplitEnumerator.Current (#10849)

Author: stephentoub

xml/System.Text.RegularExpressions/Regex+ValueSplitEnumerator.xml

@@ -53,10 +53,9 @@
         <ReturnType>System.Range</ReturnType>
       </ReturnValue>
       <Docs>
-        <summary>Gets the <see cref="T:System.Text.RegularExpressions.ValueMatch" /> element at the current position of the enumerator.</summary>
+        <summary>Gets a <see cref="T:System.Range" /> for the split at the current position of the enumerator.</summary>
         <value>To be added.</value>
         <remarks>To be added.</remarks>
-        <exception cref="T:System.InvalidOperationException">Enumeration has either not started or has already finished.</exception>
       </Docs>
     </Member>
     <Member MemberName="GetEnumerator">