Matthew Oliver 449d83fb0c Doc uses alias instead of aliases
The overview_policies doc makes reference to an `alias` option when in
fact the option is `aliases`.
The sample storage policy snippet is correct, it's just incorrect when
listing the possible options.

This change changes the listed option to `aliases`.

Change-Id: Iddf0f19f4d50819ff6abd46e6a1156dc8e4a451d
2017-10-31 15:55:13 +11:00
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