Kevin_Zheng 78486ac3e1 Fix doc job with correct ref link
block_device_mapping.rst had bad ref link and i think with
oslosphinx 4.13 or Sphinx 1.6.2, it started throwing error.

This commit fix this.

Change-Id: Ia279fd93609664efcdb5038a50460d54dd14f254
2017-05-31 07:53:15 +00:00
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