fix order of items in RELEASE_NOTES

RELEASE_NOTES

@@ -17,6 +17,25 @@ Availability
 This release is available from: 
 http://www.nsnam.org/release/ns-allinone-3.13.tar.bz2
 
+Supported platforms
+-------------------
+ns-3.13 has been tested on the following platforms.  Not all features are
+available on all platforms; check the Installation page on the project wiki.
+
+- Ubuntu 11.10 (32 bit) with g++-4.5.2
+- Ubuntu 11.04 (32/64 bit) with g++-4.5.2 
+- Ubuntu 10.04.3 LTS (64 bit) with g++-4.4.3, g++-3.4.6 
+- OS X Lion with g++-4.2.1
+- OS X Snow Leopard with g++-4.2.1 
+- Fedora Core 16 (32/64 bit) with g++-4.6.2
+  --  however, g++-3.4.6 fails on Fedora 16 i686 
+- Fedora Core 14 (64 bit) with g++-4.5.1
+- FreeBSD 9.0-RC1 (AMD64) with g++-4.2.1
+
+New user-visible features
+-------------------------
+- IPv6 address generator with support for duplicate address detection
+
 Bugs fixed
 ----------
  - bug 962 - list of paths to reach objects contains bogus entries
@@ -60,25 +79,6 @@ Bugs fixed
  - Corrected compilation behavior in Ubuntu 11.10 due to ldd behavior change
  - Added required PTHREAD dependency to RT library check.
 
-Supported platforms
--------------------
-ns-3.13 has been tested on the following platforms.  Not all features are
-available on all platforms; check the Installation page on the project wiki.
-
-- Ubuntu 11.10 (32 bit) with g++-4.5.2
-- Ubuntu 11.04 (32/64 bit) with g++-4.5.2 
-- Ubuntu 10.04.3 LTS (64 bit) with g++-4.4.3, g++-3.4.6 
-- OS X Lion with g++-4.2.1
-- OS X Snow Leopard with g++-4.2.1 
-- Fedora Core 16 (32/64 bit) with g++-4.6.2
-  --  however, g++-3.4.6 fails on Fedora 16 i686 
-- Fedora Core 14 (64 bit) with g++-4.5.1
-- FreeBSD 9.0-RC1 (AMD64) with g++-4.2.1
-
-New user-visible features
--------------------------
-- IPv6 address generator with support for duplicate address detection
-
 Known issues
 ------------
 In general, known issues are tracked on the project tracker available