alphatically order sub-options for sensors, and make the explanations

more similar
ok jmc schwarze

src/usr.sbin/ntpd/ntpd.conf.5

@@ -1,4 +1,4 @@
-.\" $OpenBSD: ntpd.conf.5,v 1.38 2019/11/06 13:35:25 otto Exp $
+.\" $OpenBSD: ntpd.conf.5,v 1.39 2019/11/10 18:46:53 deraadt Exp $
 .\"
 .\" Copyright (c) 2003, 2004 Henning Brauer <henning@openbsd.org>
 .\"
@@ -14,7 +14,7 @@
 .\" AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
 .\" OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 .\"
-.Dd $Mdocdate: November 6 2019 $
+.Dd $Mdocdate: November 10 2019 $
 .Dt NTPD.CONF 5
 .Os
 .Sh NAME
@@ -79,9 +79,9 @@ query from 2001:db8::1
 .Ed
 .It Xo Ic sensor Ar device
 .Op Ic correction Ar microseconds
-.Op Ic weight Ar weight-value
-.Op Ic refid Ar string
+.Op Ic refid Ar ID-string
 .Op Ic stratum Ar stratum-value
+.Op Ic weight Ar weight-value
 .Xc
 Specify a timedelta sensor device
 .Xr ntpd 8
@@ -103,7 +103,9 @@ sensor *
 sensor nmea0
 .Ed
 .Pp
-An optional correction in microseconds can be given to compensate
+A
+.Ic correction
+in microseconds can be given to compensate
 for the sensor's offset.
 The maximum correction is 127 seconds.
 For example, if a DCF77 receiver is lagging 70ms behind
@@ -112,22 +114,16 @@ actual time:
 sensor udcf0 correction 70000
 .Ed
 .Pp
-The optional
-.Ic weight
-keyword permits finer control over the relative importance
-of time sources (servers or sensor devices).
-Weights are specified in the range 1 to 10;
-if no weight is given,
-the default is 1.
-A server with a weight of 5, for example,
-will have five times more influence on time offset calculation
-than a server with a weight of 1.
-.Pp
-An optional reference ID string - up to 4 ASCII characters - can be
+A
+.Ic refid
+.Ar ID-string
+of up up to 4 ASCII characters can be
 given to publish the sensor type to clients.
 RFC 2030 suggests some common reference identifiers, but new identifiers
 "can be contrived as appropriate."
-If an ID string is not given,
+If an
+.Ar ID-string
+is not given,
 .Xr ntpd 8
 will use a generic reference ID.
 For example:
@@ -135,9 +131,20 @@ For example:
 sensor nmea0 refid GPS
 .Ed
 .Pp
-A stratum value other than the default of 1 can be assigned using the
+The
 .Ic stratum
-keyword.
+keyword can be used to change the stratum value from the default of 1.
+.Pp
+The
+.Ic weight
+keyword permits finer control over the relative importance
+of time sources (servers or sensor devices).
+Weights are specified in the range 1 to 10;
+if no weight is given,
+the default is 1.
+A server with a weight of 5, for example,
+will have five times more influence on time offset calculation
+than a server with a weight of 1.
 .It Xo Ic server Ar address
 .Op Ic weight Ar weight-value
 .Xc