doc: Remove unicode prefixes
doc: Remove unicode prefixes

rst2pdf only supports Python 3 now, which means the unicode string
prefix is unnecessary - strings are unicode by default in Python 3.

We also fix some formatting so people copy-pasting the configuration
into 'conf.py' files won't have to immediately resolve PEP8 issues.

Signed-off-by: Stephen Finucane <06fa905d7f2aaced6dc72e9511c71a2a51e8aead@that.guru>

rst2pdf/rst2pdf,rst2pdf/rst2pdf