uefi.8: update HISTORY and remove incomplete AUTHORS

- EFI support appeared in 5.0 for ia64
- arm64 UEFI support added in 11.0

The AUTHORS section included the folks responsible for the bulk of the
work to bring UEFI support to amd64, but missed those who did the
original work on ia64, the initial port to i386, the ports to arm64 and
arm, and have generally maintained and improved general UEFI support
since then.  It's unwieldly to include everyone and would quickly become
outdated again anyhow, so just remove the AUTHORS section.

Reviewed by:	manu
Discussed with:	jhb
Differential Revision:	https://reviews.freebsd.org/D14033

share/man/man8/uefi.8

@@ -24,7 +24,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 23, 2017
+.Dd January 24, 2018
 .Dt UEFI 8
 .Os
 .Sh NAME
@@ -143,20 +143,13 @@ typical non-default kernel (optional)
 .Xr gpart 8 ,
 .Xr uefisign 8
 .Sh HISTORY
+EFI boot support for the ia64 architecture first appeared in
+.Fx 5.0 .
 .Nm
-boot support first appeared in
-.Fx 10.1 .
-.Sh AUTHORS
-.An -nosplit
-.Nm
-boot support was developed by
-.An Benno Rice Aq Mt benno@FreeBSD.org ,
-.An \&Ed Maste Aq Mt emaste@FreeBSD.org ,
-and
-.An Nathan Whitehorn Aq Mt nwhitehorn@FreeBSD.org .
-The
-.Fx
-Foundation sponsored portions of the work.
+boot support for amd64 first appeared in
+.Fx 10.1
+and for arm64 in
+.Fx 11.0 .
 .Sh CAVEATS
 EFI environment variables are not supported by
 .Xr loader 8