adding help files

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@9437 71c3de6d-444a-0410-be80-ed276b4c234a

war/resources/help/system-config/master-slave/demand/idleDelay.html

+<div>
+    The number of minutes that this slave must remain idle before taking it off-line.
+</div>
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war/resources/help/system-config/master-slave/demand/inDemandDelay.html

+<div>
+    The number of minutes for which jobs must be waiting in the queue before
+    attempting to launch this slave.
+</div>
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