use .Mt to mark up email addresses consistently (part1)

PR:		191174
Submitted by:	Franco Fichtner  <franco@lastsummer.de>

ggatec/ggatec.8

@@ -178,4 +178,4 @@ client# mount_cd9660 /dev/ggate0 /cdrom
 The
 .Nm
 utility as well as this manual page was written by
-.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
+.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org .

ggated/ggated.8

@@ -108,4 +108,4 @@ Export CD-ROM device and a file:
 The
 .Nm
 utility as well as this manual page was written by
-.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
+.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org .

ggatel/ggatel.8

@@ -152,4 +152,4 @@ ggatel destroy -u 5
 The
 .Nm
 utility as well as this manual page was written by
-.An Pawel Jakub Dawidek Aq pjd@FreeBSD.org .
+.An Pawel Jakub Dawidek Aq Mt pjd@FreeBSD.org .