manuals: Fix "skipping end of block" .El errors

These were reported by `mandoc -T lint ...` as errors; this commit only
handles unnecessary .El commands.

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

Signed-off-by:	Graham Percival <gperciva@tarsnap.com>
Reviewed by:	mhorne
MFC after:	3 days
Sponsored by:	Tarsnap Backup Inc.
Pull Request:	https://github.com/freebsd/freebsd-src/pull/1447

(cherry picked from commit c801836ff43deea3c86935abcad1069bfcd3989c)

cddl/usr.sbin/zfsd/zfsd.8

@@ -154,7 +154,6 @@ will log interesting events and its actions to syslog with facility
 .Em daemon
 and identity
 .Op zfsd .
-.El
 .Sh FILES
 .Bl -tag -width a -compact
 .It Pa /var/db/zfsd/cases

share/man/man4/gve.4

@@ -127,7 +127,6 @@ Tx queue-specific allocation failures:
 .It "Failed to alloc desc ring for tx ring %d"
 .It "Failed to vmap fifo, qpl_id = %d"
 .El
-.El
 .Pp
 The following messages are recorded when the interface detach fails:
 .Bl -diag
@@ -200,7 +199,6 @@ does not support the transmission of VLAN-tagged packets.
 All VLAN-tagged traffic is dropped.
 .Sh SUPPORT
 Please email gvnic-drivers@google.com with the specifics of the issue encountered.
-.El
 .Sh SEE ALSO
 .Xr ifconfig 8 ,
 .Xr netstat 8

share/man/man4/mem.4

@@ -200,7 +200,6 @@ should be set to
 to update an existing or establish a new range, or to
 .Dv MEMRANGE_SET_REMOVE
 to remove a range.
-.El
 .Ss Live Kernel Dumps
 .Pp
 The

usr.sbin/pnfsdskill/pnfsdskill.8

@@ -62,7 +62,6 @@ by the MDS or reported to the MDS by a client.
 .Pp
 The pNFS service should continue to run normally so long as the number of
 operational DSs is at least as many as the level of mirroring.
-.El
 .Sh SEE ALSO
 .Xr nfsv4 4 ,
 .Xr pnfs 4 ,