stand/man: Fix mdoc typos for emails, tag spdx

MFC after:	3 days

stand/man/boot1.efi.8

@@ -1,4 +1,6 @@
 .\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 2020 Netflix, Inc
 .\"
 .\" Redistribution and use in source and binary forms, with or without

stand/man/loader.8

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 1999 Daniel C. Sobral
 .\" All rights reserved.
 .\" Copyright (c) 2021 Warner Losh <imp@FreeBSD.org>
@@ -115,11 +118,11 @@ scripting language changed to Lua by default in
 The
 .Nm
 was written by
-.An Michael Smith Aq msmith@FreeBSD.org .
+.An Michael Smith Aq Mt msmith@FreeBSD.org .
 .Pp
 FICL was written by
-.An John Sadler Aq john_sadler@alum.mit.edu .
+.An John Sadler Aq Mt john_sadler@alum.mit.edu .
 .Pp
-.An Warner Losh Aq imp@FreeBSD.org
+.An Warner Losh Aq Mt imp@FreeBSD.org
 integrated Lua into the tree based on initial work done by Pedro Souza
 for the 2014 Google Summer of Code.

stand/man/loader_4th.8

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 1999 Daniel C. Sobral
 .\" All rights reserved.
 .\"
@@ -576,8 +579,8 @@ first appeared in
 The
 .Nm
 was written by
-.An Michael Smith Aq msmith@FreeBSD.org .
+.An Michael Smith Aq Mt msmith@FreeBSD.org .
 .Pp
 .Tn FICL
 was written by
-.An John Sadler Aq john_sadler@alum.mit.edu .
+.An John Sadler Aq Mt john_sadler@alum.mit.edu .

stand/man/loader_lua.8

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 1999 Daniel C. Sobral
 .\" All rights reserved.
 .\"

stand/man/loader_simp.8

@@ -1,3 +1,6 @@
+.\"
+.\" SPDX-License-Identifier: BSD-2-Clause
+.\"
 .\" Copyright (c) 1999 Daniel C. Sobral
 .\" All rights reserved.
 .\"
@@ -755,4 +758,4 @@ first appeared in
 The
 .Nm
 was written by
-.An Michael Smith Aq msmith@FreeBSD.org .
+.An Michael Smith Aq Mt msmith@FreeBSD.org .