fix whitespace in xsltproc output

Index: lckdo.docbook
--- lckdo.docbook.orig
+++ lckdo.docbook
@@ -50,8 +50,7 @@ Public domain.
 		
 		<para><command>lckdo</command> runs a program with a lock
 		held, in order to prevent multiple processes from running in
-		parallel. Use just like <command>nice</command> or
-		<command>nohup</command>.</para>
+		parallel. Use just like <command>nice</command> or <command>nohup</command>.</para>
 
 		<para>Now that util-linux contains a similar command
 		named <command>flock</command>, lckdo is deprecated,