Update xml/System.Net/Authorization.xml

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

Author: gewarren

xml/System.Net/Authorization.xml

@@ -48,7 +48,7 @@
     </Attribute>
   </Attributes>
   <Docs>
-    <summary>Contains an authentication message for an internet server.</summary>
+    <summary>Contains an authentication message for an Internet server.</summary>
     <remarks>To be added.</remarks>
     <altmember cref="T:System.Net.IAuthenticationModule" />
   </Docs>