fix whitespace in xsltproc output

Index: ifdata.docbook
--- ifdata.docbook.orig
+++ ifdata.docbook
@@ -62,8 +62,7 @@ with this program; if not, write to the Free Software 
 			<command>ifdata</command> can be used to check for
 			the existence of a network interface, or to get
 			information about the interface, such as its IP
-			address. Unlike <command>ifconfig</command> or
-			<command>ip</command>, <command>ifdata</command>
+			address. Unlike <command>ifconfig</command> or <command>ip</command>, <command>ifdata</command>
 			has simple to parse output that is designed to be
 			easily used by a shell script.
 		</para>