chapter07: Missed section title translation in sysv usage

chapter07/usage.xml

@@ -297,7 +297,7 @@ EOF</userinput></screen>
   </sect2>
 
   <sect2 id="ch-scripts-clock">
-    <title>Configuring the System Clock</title>
+    <title>配置系统时钟</title>
 
     <indexterm zone="ch-scripts-clock">
       <primary sortas="d-scripts-setclock">setclock</primary>