Fix ISO week format

IcanDivideBy0 · kay-kim · commit 292cfea75621 · 2019-05-17T12:30:13.000-04:00
ISO week format is zero-padded
diff --git a/source/reference/operator/aggregation/dateToString.txt b/source/reference/operator/aggregation/dateToString.txt
@@ -123,7 +123,7 @@ The following format specifiers are available for use in the
 
        .. versionadded:: 3.4
 
-     - ``1``-``53``
+     - ``01``-``53``
 
 
    * - ``%w``
