Fix incorrect placement of two Intel gdb/NEWS items

there were two commits which placed new gdb/NEWS items to the bottom of the
NEWS file (such as for gdb-4.0) instead at their right place under:
	*** Changes in GDB 7.8

https://sourceware.org/git/?p=binutils-gdb.git;a=blobdiff;f=gdb/NEWS;h=ae84e009b8008f9da2707829c0cbab358abc17fb;hp=a8ae8c7b7a5ddce9b5779914dd1e6a87463d7d60;hb=ca8941bbd088002cb8ff87abe16d02ecc8d58d1e;hpb=489e41ddf4bb5616a7471fb4072df5efbb9a706e
commit ca8941bbd088002cb8ff87abe16d02ecc8d58d1e
Author: Walfred Tedeschi <walfred.tedeschi@intel.com>
Date:   Tue Dec 3 13:31:03 2013 +0000
    Documentation for MPX.
Message-Id: <1386074172-14177-1-git-send-email-walfred.tedeschi@intel.com>
https://sourceware.org/ml/gdb-patches/2013-12/msg00082.html

and

https://sourceware.org/git/?p=binutils-gdb.git;a=blobdiff;f=gdb/NEWS;h=a7067fdf9a7af422572a29d1fdd6ef011c87cd9f;hp=b72d64db313d0785edec19a9c4b441b854698e6a;hb=01f9f808e2e86187c95e7cff4aeb014a421a53ce;hpb=93ee1e3683a12f4774b8beb4f821910982e21ce2
commit 01f9f808e2e86187c95e7cff4aeb014a421a53ce
Author: Michael Sturm <michael.sturm@intel.com>
Date:   Mon Dec 16 16:43:05 2013 +0100
    Add AVX512 registers support to GDB and GDBserver.
Message-Id: <1398258160-9070-4-git-send-email-michael.sturm@intel.com>
https://sourceware.org/ml/gdb-patches/2013-12/msg00818.html

gdb/
2014-08-04  Jan Kratochvil  <jan.kratochvil@redhat.com>

	* NEWS (Changes in GDB-4.0): Move Intel MPX and Intel AVX-512 items ...
	(Changes in GDB 7.8): ... here.

Message-ID: <20140804165708.GA12824@host2.jankratochvil.net>
Automatic date update in version.in
Merge remote-tracking branch 'gnu/gdb-7.8-branch' into 7.8