Wording improvement for write-cache disabling instructions.

doc/src/sgml/wal.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.48 2007/12/10 14:51:10 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/wal.sgml,v 1.49 2007/12/10 22:08:36 momjian Exp $ -->
 
 <chapter id="wal">
  <title>Reliability and the Write-Ahead Log</title>
@@ -66,7 +66,7 @@
    <application>atacontrol</>.  (For SCSI disks use <ulink
    url="http://sg.torque.net/sg/sdparm.html"><application>sdparm</></ulink>
    to turn off <literal>WCE</>.)  On <productname>Windows</> write caching is
-   controlled by <literal>My Computer\Open\{select disk
+   disabled by unchecking <literal>My Computer\Open\{select disk
    drive}\Properties\Hardware\Properties\Policies\Enable write caching on
    the disk</>.
   </para>