Properly format NAME subsection of zfs/zpool subcommands

Use proper names (i.e. zfs-allow and zpool-add) in NAME subsections
of zfs/zpool subcommands instead of current "pretty-printed" ones as
makewhatis utilities (or some implementations of it, namely the one
from mandoc suite used in FreeBSD) look not only at the document title
but also in NAME subsection, adding zfs(8)/zpool(8) to search results
which is not correct. (Common sense and other utilities splitting
subcommands in multiple man pages, e.g. git, do the same.)

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: xtouqh <xtouqh@hotmail.com>
Closes #11086

man/man8/zfs-set.8

@@ -34,14 +34,14 @@
 .Dt ZFS-SET 8
 .Os
 .Sh NAME
-.Nm zfs Ns Pf - Cm set
+.Nm zfs-set
 .Nd Sets the property or list of properties to the given value(s) for each dataset.
 .Sh SYNOPSIS
-.Nm
+.Nm zfs
 .Cm set
 .Ar property Ns = Ns Ar value Oo Ar property Ns = Ns Ar value Oc Ns ...
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns ...
-.Nm
+.Nm zfs
 .Cm get
 .Op Fl r Ns | Ns Fl d Ar depth
 .Op Fl Hp
@@ -50,14 +50,14 @@
 .Oo Fl t Ar type Ns Oo , Ns Ar type Oc Ns ... Oc
 .Cm all | Ar property Ns Oo , Ns Ar property Oc Ns ...
 .Oo Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns | Ns Ar bookmark Oc Ns ...
-.Nm
+.Nm zfs
 .Cm inherit
 .Op Fl rS
 .Ar property Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns ...
 .Sh DESCRIPTION
 .Bl -tag -width ""
 .It Xo
-.Nm
+.Nm zfs
 .Cm set
 .Ar property Ns = Ns Ar value Oo Ar property Ns = Ns Ar value Oc Ns ...
 .Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns ...
@@ -79,7 +79,7 @@ For more information, see the
 section of
 .Xr zfsprops 8 .
 .It Xo
-.Nm
+.Nm zfs
 .Cm get
 .Op Fl r Ns | Ns Fl d Ar depth
 .Op Fl Hp
@@ -160,7 +160,7 @@ or
 .Sy all .
 .El
 .It Xo
-.Nm
+.Nm zfs
 .Cm inherit
 .Op Fl rS
 .Ar property Ar filesystem Ns | Ns Ar volume Ns | Ns Ar snapshot Ns ...