Adding initial value for SETTINGS_INITIAL_WINDOW_SIZE. More clarifica…

…tion. Closes httpwg#384.

draft-ietf-httpbis-http2.xml

@@ -1702,7 +1702,7 @@ HTTP2-Settings    = token68
                 <x:lt hangText="SETTINGS_INITIAL_WINDOW_SIZE (4):" anchor="SETTINGS_INITIAL_WINDOW_SIZE">
                   <t>
                     Indicates the sender's initial window size (in bytes) for stream level flow
-                    control.
+                    control.  The initial value is 65,535.
                   </t>
                   <t>
                     This setting affects the window size of all streams, including existing
@@ -2159,11 +2159,12 @@ HTTP2-Settings    = token68
 
           <section anchor="InitialWindowSize" title="Initial Flow Control Window Size">
             <t>
-              When an HTTP/2 connection is first established, new streams are created with an initial
-              flow control window size of 65,535 bytes. The connection flow control window is 65,535
-              bytes.  Both endpoints can adjust the initial window size for new streams by including
-              a value for <x:ref>SETTINGS_INITIAL_WINDOW_SIZE</x:ref> in the <x:ref>SETTINGS</x:ref>
-              frame that forms part of the connection preface.
+              When an HTTP/2 connection is first established, new streams are created with an
+              initial flow control window size of 65,535 bytes. The connection flow control window
+              is 65,535 bytes.  Both endpoints can adjust the initial window size for new streams by
+              including a value for <x:ref>SETTINGS_INITIAL_WINDOW_SIZE</x:ref> in the
+              <x:ref>SETTINGS</x:ref> frame that forms part of the connection preface.  The
+              connection flow control window initial size cannot be changed.
             </t>
             <t>
               Prior to receiving a <x:ref>SETTINGS</x:ref> frame that sets a value for