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 <stephen@that.guru>

doc/manual.rst

@@ -1712,7 +1712,7 @@ Sphinx_ is a very popular tool. This is the description from its website:
     has excellent support for the documentation of Python projects, but other
     documents can be written with it too.
 
-rst2pdf includes an experimental PDF extension for sphinx.
+rst2pdf includes an experimental PDF extension for Sphinx.
 
 To use it in your existing Sphinx project you need to do the following:
 
@@ -1732,85 +1732,85 @@ To use it in your existing Sphinx project you need to do the following:
     # For example: r'Guido van Rossum\\Fred L. Drake, Jr., editor'
     #
     # The options element is a dictionary that lets you override
-    # this config per-document.
-    # For example,
-    # ('index', u'MyProject', u'My Project', u'Author Name',
-    #  dict(pdf_compressed = True))
+    # this config per-document. For example:
+    #
+    # ('index', 'MyProject', 'My Project', 'Author Name', {'pdf_compressed': True})
+    #
     # would mean that specific document would be compressed
-    # regardless of the global pdf_compressed setting.
+    # regardless of the global 'pdf_compressed' setting.
 
     pdf_documents = [
-        ('index', u'MyProject', u'My Project', u'Author Name'),
+        ('index', 'MyProject', 'My Project', 'Author Name'),
     ]
 
     # A comma-separated list of custom stylesheets. Example:
-    pdf_stylesheets = ['sphinx','kerning','a4']
+    pdf_stylesheets = ['sphinx', 'kerning', 'a4']
 
     # A list of folders to search for stylesheets. Example:
     pdf_style_path = ['.', '_styles']
 
     # Create a compressed PDF
     # Use True/False or 1/0
     # Example: compressed=True
-    #pdf_compressed = False
+    # pdf_compressed = False
 
     # A colon-separated list of folders to search for fonts. Example:
     # pdf_font_path = ['/usr/share/fonts', '/usr/share/texmf-dist/fonts/']
 
     # Language to be used for hyphenation support
-    #pdf_language = "en_US"
+    # pdf_language = "en_US"
 
     # Mode for literal blocks wider than the frame. Can be
     # overflow, shrink or truncate
-    #pdf_fit_mode = "shrink"
+    # pdf_fit_mode = "shrink"
 
     # Section level that forces a break page.
     # For example: 1 means top-level sections start in a new page
     # 0 means disabled
-    #pdf_break_level = 0
+    # pdf_break_level = 0
 
     # When a section starts in a new page, force it to be 'even', 'odd',
     # or just use 'any'
-    #pdf_breakside = 'any'
+    # pdf_breakside = 'any'
 
     # Insert footnotes where they are defined instead of
     # at the end.
-    #pdf_inline_footnotes = True
+    # pdf_inline_footnotes = True
 
     # verbosity level. 0 1 or 2
-    #pdf_verbosity = 0
+    # pdf_verbosity = 0
 
     # If false, no index is generated.
-    #pdf_use_index = True
+    # pdf_use_index = True
 
     # If false, no modindex is generated.
-    #pdf_use_modindex = True
+    # pdf_use_modindex = True
 
     # If false, no coverpage is generated.
-    #pdf_use_coverpage = True
+    # pdf_use_coverpage = True
 
     # Name of the cover page template to use
-    #pdf_cover_template = 'sphinxcover.tmpl'
+    # pdf_cover_template = 'sphinxcover.tmpl'
 
     # Documents to append as an appendix to all manuals.
-    #pdf_appendices = []
+    # pdf_appendices = []
 
     # Enable experimental feature to split table cells. Use it
     # if you get "DelayedTable too big" errors
-    #pdf_splittables = False
+    # pdf_splittables = False
 
     # Set the default DPI for images
-    #pdf_default_dpi = 72
+    # pdf_default_dpi = 72
 
     # Enable rst2pdf extension modules (default is only vectorpdf)
     # you need vectorpdf if you want to use sphinx's graphviz support
-    #pdf_extensions = ['vectorpdf']
+    # pdf_extensions = ['vectorpdf']
 
     # Page template name for "regular" pages
-    #pdf_page_template = 'cutePage'
+    # pdf_page_template = 'cutePage'
 
     # Show Table Of Contents at the beginning?
-    #pdf_use_toc = True
+    # pdf_use_toc = True
 
     # How many levels deep should the table of contents be?
     pdf_toc_depth = 9999