Matt Riedemann 781a0286b5 api-ref: fix default sort key when listing servers
The default sort key when listing servers is the
'created_at' field, which is also in the list of
available sort keys in the same description for
this parameter. The 'created' field doesn't exist.

Change-Id: I7a971c421e69cc7a5630454305ee2cddaf0e92d3
2017-09-21 11:01:03 -04:00
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