Update NEWS file accoding to my last patch (r80311 about gdb)

Move test_gdb issues to the Tests section.
diff --git a/Misc/NEWS b/Misc/NEWS
index 56aa776..551e39d 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -318,8 +318,6 @@
 Library
 -------
 
-- Issues #8279, #8330, #8437: Fix test_gdb failures, patch written by Dave Malcolm
-
 - Issue #6547: Added the ignore_dangling_symlinks option to shutil.copytree.
 
 - Issue #1540112: Now allowing the choice of a copy function in 
@@ -1096,6 +1094,9 @@
 Tests
 -----
 
+- Issues #8279, #8330, #8437, #8480: Fix test_gdb failures, patch written by
+  Dave Malcolm
+
 - Issue #3864: Skip three test_signal tests on freebsd6 because they fail
   if any thread was previously started, most likely due to a platform bug.