AUTHORS: update email for Mark Gray

Update email address for Mark Gray

Signed-off-by: Mark Gray <mark.d.gray@redhat.com>
Signed-off-by: Han Zhou <hzhou@ovn.org>

.mailmap

@@ -52,6 +52,7 @@ Joe Stringer <joe@ovn.org> <joestringer@nicira.com>
 Justin Pettit <jpettit@ovn.org> <jpettit@nicira.com>
 Kmindg <kmindg@gmail.com>
 Kyle Mestery <mestery@mestery.com> <kmestery@cisco.com>
+Mark Gray <mark.d.gray@redhat.com> <mark.d.gray@intel.com>
 Mauricio Vasquez <mauricio.vasquez@polito.it> <mauricio.vasquezbernal@studenti.polito.it>
 Miguel Angel Ajo <majopela@redhat.com> <mangelajo@redhat.com>
 Neil McKee <neil.mckee@inmon.com>

AUTHORS.rst

@@ -250,7 +250,7 @@ Manohar K C                        manukc@gmail.com
 Manoj Sharma                       manoj.sharma@nutanix.com
 Marcin Mirecki                     mmirecki@redhat.com
 Mario Cabrera                      mario.cabrera@hpe.com
-Mark D. Gray                       mark.d.gray@intel.com
+Mark D. Gray                       mark.d.gray@redhat.com
 Mark Hamilton
 Mark Kavanagh                      mark.b.kavanagh81@gmail.com
 Mark Maglana                       mmaglana@gmail.com