Bump space for previous. Formatting fix.

share/man/man9/mb.9

@@ -1,4 +1,4 @@
-.\"	$NetBSD: mb.9,v 1.7 2017/11/12 21:20:20 riastradh Exp $
+.\"	$NetBSD: mb.9,v 1.8 2017/11/13 09:10:47 wiz Exp $
 .\"
 .\" Copyright (c) 2007 The NetBSD Foundation, Inc.
 .\" All rights reserved.
@@ -27,7 +27,7 @@
 .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 .\" POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd January 2, 2011
+.Dd November 12, 2017
 .Dt MB 9
 .Os
 .Sh NAME
@@ -49,7 +49,7 @@
 .Nm
 .Em API is deprecated; use
 .Xr membar_ops 3
-.Em instead.
+.Em instead .
 .Pp
 Many types of processor can execute instructions in a different order
 than issued by the compiler or assembler.