Update QuicReceiveWindowSizes.xml with .ctor summary (dotnet#10239)

* Update QuicReceiveWindowSizes.xml with .ctor summary

* Update xml/System.Net.Quic/QuicReceiveWindowSizes.xml

Author: rzikm

xml/System.Net.Quic/QuicReceiveWindowSizes.xml

@@ -31,7 +31,7 @@
       </AssemblyInfo>
       <Parameters />
       <Docs>
-        <summary>To be added.</summary>
+        <summary>Initializes a new instance of the <see cref="T:System.Net.Quic.QuicReceiveWindowSizes" /> class.</summary>
         <remarks>To be added.</remarks>
       </Docs>
     </Member>