Release notes and changes updated for Hybla and HighSpeed

CHANGES.html

@@ -61,6 +61,7 @@ us a note on ns-developers mailing list.</p>
   <li>TCP-related changes:
     <ul>
       <li>TCP Reno, 793, and Tahoe were removed.</li>
+      <li>TCP Hybla and HighSpeed have been added.</li>
       <li>Added the concept of Congestion State Machine inside TcpSocketBase.</li>
       <li>Merged Fast Recovery and Fast Retransmit inside TcpSocketBase.</li>
       <li>Some member variables have been moved from TcpSocketBase inside TcpSocketState. Attributes are not touched.</li>

RELEASE_NOTES

@@ -27,7 +27,7 @@ improvements:  1) congestion control has been aligned with the Linux
 architecture, to facilitate easier coding of new congestion control algorithms
 or porting implementations from the Linux kernel, 2) Fast Retransmit and Fast
 recovery algorithms, compliant to RFCs, are shared by all TCP variants, unlike
-previous releases.
+previous releases. 3) TCP Hybla and TCP HighSpeed have been added.
 
 Bugs fixed
 ----------