Remove tabs from SGML

doc/src/sgml/wal.sgml

@@ -81,7 +81,7 @@
         a <literal>*</> next to <literal>Write cache</>.  <command>hdparm -W</>
         can be used to turn off write caching.  SCSI drives can be queried
         using <ulink url="http://sg.danny.cz/sg/sdparm.html"><application>sdparm</></ulink>.
-	    for SCSI drives.  Use <command>sdparm --get=WCE</command> to check
+        for SCSI drives.  Use <command>sdparm --get=WCE</command> to check
         whether the write cache is enabled and <command>sdparm --clear=WCE</>
         to disable it.
       </para>
@@ -96,7 +96,7 @@
     </listitem>
 
     <listitem>
-	  <para>
+      <para>
         On <productname>Solaris</>, the disk write cache is controlled by
         <ulink url="http://www.sun.com/bigadmin/content/submitted/format_utility.jsp"><literal>format -e</></ulink>.
         (The Solaris <acronym>ZFS</> file system is safe with disk write-cache