Make job hold example more clear

doc/html/faq.shtml

@@ -588,10 +588,10 @@ task on the second node.</p>
 (e.g. place it into a <i>hold</i> state)?</b></a><br>
 The easiest way to do this is to change a job's earliest begin time
 (optionally set at job submit time using the <i>--begin</i> option).
-The example below places a job into hold state (preventing its start
-until 10 January 2020 at noon) and later permitting it to start now.</p>
+The example below places a job into hold state (preventing its initiation
+for 30 days) and later permitting it to start now.</p>
 <pre>
-$ scontrol update JobId=1234 StartTime=2020-01-10T12:00:00
+$ scontrol update JobId=1234 StartTime=now+30days
 ... later ...
 $ scontrol update JobId=1234 StartTime=now
 </pre>
@@ -1147,6 +1147,6 @@ fi
 
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-<p style="text-align:center;">Last modified 22 January 2009</p>
+<p style="text-align:center;">Last modified 18 February 2009</p>
 
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