Stephen Finucane 6b7b018cb6 Use Sphinx 1.5 warning-is-error
With pbr 2.0 and Sphinx 1.5, the setting for treat sphinx warnings as
errors is setting warning-is-error in build_sphinx section. Migrate the
setting from the old warnerrors one.

This involves a couple of changes to the docs to fix the now broken
build.

Change-Id: I9bee7f6f9c69a9ed7bb22325ad1a0a1316dde526
2017-04-20 13:57:16 +01:00
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