Relocate nextafter.3 changes under math function list.

Changes

@@ -34,17 +34,17 @@ Apologies if I missed anyone!
 New and rewritten pages
 -----------------------
 
-clock_getcpuclockid.3
-    mtk
-        New page documenting the clock_getcpuclockid() library function,
-        available since glibc 2.2.
-
 move_pages.2
     Christoph Lameter, various edits and improvements by mtk
         Documentation of the move_pages() system call.
         This page was formerly part of the numactl package, but really
         belongs in man-pages (since it describes a kernel interface).
 
+clock_getcpuclockid.3
+    mtk
+        New page documenting the clock_getcpuclockid() library function,
+        available since glibc 2.2.
+
 udplite.7
     Gerrit Renker
         Document the Linux implementation of the UDP-Lite protocol,
@@ -317,11 +317,6 @@ mktemp.3
     mtk
         CONFORMING TO: POSIX.1-2008 removes the specification of mktemp().
 
-nextafter.3
-    mtk
-        BUGS: In glibc 2.5 and earlier these functions do not raise an
-        FE_UNDERFLOW exception on underflow.
-
 opendir.3
     mtk
         CONFORMING TO: POSIX.1-2008 specifies fdopendir().
@@ -472,6 +467,11 @@ lround.3
     mtk
         Add reference to fenv(3) for discussion of current rounding mode.
 
+nextafter.3
+    mtk
+        BUGS: In glibc 2.5 and earlier these functions do not raise an
+        FE_UNDERFLOW exception on underflow.
+
 pow.3
     mtk
         BUGS: described buggy NaN return when x is negative and y is large.