Updated comment on enum System.Net.HttpStatusCode (#12138)

* Updated comment on enum System.Net.HttpStatusCode

* Fix typo in HTTP status codes summary

* Update to RFC 9110

---------

Co-authored-by: Miha Zupan <[email protected]>

Author: abatishchev

xml/System.Net/HttpStatusCode.xml

@@ -50,7 +50,7 @@
     <BaseTypeName>System.Enum</BaseTypeName>
   </Base>
   <Docs>
-    <summary>Contains the values of status codes defined for HTTP defined in RFC 2616 for HTTP 1.1.</summary>
+    <summary>Contains the values of HTTP status codes as defined by RFC 9110, section 15.</summary>
     <remarks>To be added.</remarks>
   </Docs>
   <Members>