Fix warning in lines.py
Indent correctly in mlab
silence warnings in art3d
Fix warnings in cbook

Deprecation examples and a line continuation
Fix warnings in _axes

Render other args of title better, etc
fix rendering of warnings in mlab
Improve rendering of title docs
docstring in trirefine
Merge pull request #3548 from jenshnielsen/autodoc_fixes

Silence some Sphinx warnings by rewriting docstrings.