upstream commit

tweak the uri text, specifically removing some markup to
make it a bit more readable;

issue reported by - and diff ok - millert

OpenBSD-Commit-ID: 8b56a20208040b2d0633536fd926e992de37ef3f
diff --git a/sftp.1 b/sftp.1
index 49f7feb..9b03280 100644
--- a/sftp.1
+++ b/sftp.1
@@ -1,4 +1,4 @@
-.\" $OpenBSD: sftp.1,v 1.111 2017/10/21 23:06:24 millert Exp $
+.\" $OpenBSD: sftp.1,v 1.112 2017/10/25 06:19:46 jmc Exp $
 .\"
 .\" Copyright (c) 2001 Damien Miller.  All rights reserved.
 .\"
@@ -22,7 +22,7 @@
 .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 .\"
-.Dd $Mdocdate: October 21 2017 $
+.Dd $Mdocdate: October 25 2017 $
 .Dt SFTP 1
 .Os
 .Sh NAME
@@ -30,7 +30,6 @@
 .Nd secure file transfer program
 .Sh SYNOPSIS
 .Nm sftp
-.Bk -words
 .Op Fl 46aCfpqrv
 .Op Fl B Ar buffer_size
 .Op Fl b Ar batchfile
@@ -58,10 +57,13 @@
 The
 .Ar destination
 may be specified either as
-.Oo Ar user Ns @ Oc Ns Ar host Ns Oo : Ns Ar path Oc
-or as an sftp URI in the form
-.No sftp:// Ns Oo Ar user Ns @ Oc Ns Ar host Ns
-.Oo : Ns Ar port Oc Ns Oo / Ns Ar path Oc .
+.Sm off
+.Oo user @ Oc host Op : path
+.Sm on
+or as a URI in the form
+.Sm off
+.No sftp:// Oo user @ Oc host Oo : port Oc Op / path .
+.Sm on
 .Pp
 If the
 .Ar destination