Update xml/System.Security.Cryptography.X509Certificates/X509RevocationMode.xml

Co-authored-by: Genevieve Warren <[email protected]>

Author: bartonjs

xml/System.Security.Cryptography.X509Certificates/X509RevocationMode.xml

@@ -113,7 +113,7 @@
       </ReturnValue>
       <MemberValue>0</MemberValue>
       <Docs>
-        <summary>Specifies that revocation checks should not be performed.</summary>
+        <summary>Revocation checks should not be performed.</summary>
       </Docs>
     </Member>
     <Member MemberName="Offline">