fix 'an unique' to 'a unique'
Change-Id: I1a0aaa6b76acd43e90c539cc324291dd6d729359
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@ -116,7 +116,7 @@ file**
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``storage_policies``
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Storage policies determine on which hardware data is stored, how
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the data is stored across that hardware, and in which region the
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data resides. Each storage policy must have an unique ``name``
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data resides. Each storage policy must have a unique ``name``
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and a unique ``index``. There must be a storage policy with an
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index of 0 in the ``swift.yml`` file to use any legacy containers
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created before storage policies were instituted.
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