udev - add %s{filename} to man page

@@ -195,6 +195,13 @@
 (This does not work within the
 .B PROGRAM
 field for the obvious reason.)
+.br
+A single part of the string, separated by the space character
+my be selected by specifying the part number as a attribute:
+.BI %c{ part }
+.TP
+.BI %s{ filename }
+The content of a sysfs attribute.
 .TP
 .B %%
 The '%' char itself.

@@ -20,16 +20,20 @@
 .BR udev (8)
 instance is executed in the background. All further events for the same device
 are delayed until the execution is finished. This way it will never run more
-than one instance for a single device.
+than one instance for a single device at the same time.
 .br
 .B udevd
 receives the events from
 .B udevsend
 which is called by
-.BR hotplug (8)
-
+.BR hotplug (8).
+If
+.B udevd
+isn't already running,
+.B udevsend
+will start it.
 .SH "SEE ALSO"
-.BR udev (8)
+.BR udev (8), hotplug (8)
 .SH AUTHORS
 .B udevd
 was developed primarily by Kay Sievers <[email protected]>, with much help