Andreas Jaeger 371ff39c7d 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.

Fix also problems found:
* code-blocks that could not be parsed
* Usage of :option: without declaring the option.
* Add blank lines to properly end markup.
* Fix a typo.
* Fix wrong markup of docstring
* Fix title underlinings.

Change-Id: I69ddde706a04f26bfccda072822dc0d230cb330e
2017-03-04 19:59:54 +01:00
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