Remove comment from DataTable.Rows returning null (dotnet#4982)

Author: vcsjones

xml/System.Data/DataTable.xml

@@ -5496,7 +5496,7 @@ public class A {
       </ReturnValue>
       <Docs>
         <summary>Gets the collection of rows that belong to this table.</summary>
-        <value>A <see cref="T:System.Data.DataRowCollection" /> that contains <see cref="T:System.Data.DataRow" /> objects; otherwise a null value if no <see cref="T:System.Data.DataRow" /> objects exist.</value>
+        <value>A <see cref="T:System.Data.DataRowCollection" /> that contains <see cref="T:System.Data.DataRow" /> objects.</value>
         <remarks>
           <format type="text/markdown"><![CDATA[