Remove erroneous docs on SortedSet<T>(IComparer<T>) (#8931)

Author: Rob-Hague

xml/System.Collections.Generic/SortedSet`1.xml

@@ -225,11 +225,6 @@
         <remarks>
           <format type="text/markdown"><![CDATA[  
   
-## Remarks  
- If `comparer` does not implement <xref:System.IComparable%601>, you must specify an <xref:System.Collections.Generic.IComparer%601> object to be used.  
-  
-   
-  
 ## Examples  
  The following example defines a comparer (`ByFileExtension`) that is used to construct a sorted set that sorts file names by their extensions. This code example is part of a larger example provided for the <xref:System.Collections.Generic.SortedSet%601> class.  
   
@@ -240,8 +235,6 @@
   
  ]]></format>
         </remarks>
-        <exception cref="T:System.ArgumentNullException">
-          <paramref name="comparer" /> is <see langword="null" />.</exception>
       </Docs>
     </Member>
     <Member MemberName=".ctor">