New helps file for Choice timerestriction feature

diff --git a/lang/en/help/choice/timerestrict.html b/lang/en/help/choice/timerestrict.html
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+<p align="center"><b>Restrict times</b></p>
+
+<P>This setting allows you to define a time window within which 
+   participants are allowed to make a choice.</p>
+
+<p>To set an open-ended close date just set the time very far in the future.</p>
+
+<p>If you don't need this at all then uncheck the box.</p>