manuals: Fix "missing end of block" errors

These were reported by `mandoc -T lint ...` as errors.

The rendered output (in ascii and html) is not affected by this commit.

Signed-off-by:	Graham Percival <gperciva@tarsnap.com>
Reviewed by:	mhorne, Alexander Ziaee <concussious.bugzilla@runbox.com>
MFC after:	3 days
Sponsored by:	Tarsnap Backup Inc.
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1454

share/man/man9/cdefs.9

@@ -402,6 +402,7 @@ extensions are visible, 0 otherwise.
 .St -isoC-2011
 Appendix K 3.7.4.1
 extensions are visible, 0 otherwise.
+.El
 .Sh Supported C++ Environments
 .Fx
 supports C++11 and newer standards fully.

stand/man/loader_lua.8

@@ -197,6 +197,7 @@ Loader init
 .Nm
 configuration files, as described in
 .Xr loader.conf 5 .
+.El
 .Sh EXAMPLES
 Boot in single user mode:
 .Pp

stand/man/loader_simp.8

@@ -659,6 +659,7 @@ command line by booting unconditionally in
 .Pa loader.rc .
 In order for this to be effective, one should also configure the firmware
 (BIOS or UEFI) to prevent booting from unauthorized devices.
+.El
 .Sh FILES
 .Bl -tag -width /boot/loader_simp -compact
 .It Pa /boot/loader_simp
@@ -668,6 +669,7 @@ itself.
 The script run by
 .Nm
 on startup.
+.El
 .Sh EXAMPLES
 Boot in single user mode:
 .Pp

usr.bin/bintrans/bintrans.1

@@ -236,6 +236,7 @@ Decode.
 Output to
 .Ar output_file
 instead of standard output.
+.El
 .Sh EXAMPLES
 The following example packages up a source tree, compresses it,
 uuencodes it and mails it to a user on another system.