Fix warnings due to deprecated latex options (GH-1563)

diff --git a/Doc/conf.py b/Doc/conf.py
index 2c271e8..14bb641 100644
--- a/Doc/conf.py
+++ b/Doc/conf.py
@@ -82,11 +82,24 @@
 # Options for LaTeX output
 # ------------------------
 
+# Get LaTeX to handle Unicode correctly
+latex_elements = {'inputenc': r'\usepackage[utf8x]{inputenc}', 'utf8extra': ''}
+
+# Additional stuff for the LaTeX preamble.
+latex_elements['preamble'] = r'''
+\authoraddress{
+  \strong{Python Software Foundation}\\
+  Email: \email{docs@python.org}
+}
+\let\Verbatim=\OriginalVerbatim
+\let\endVerbatim=\endOriginalVerbatim
+'''
+
 # The paper size ('letter' or 'a4').
-latex_paper_size = 'a4'
+latex_elements['papersize'] = 'a4'
 
 # The font size ('10pt', '11pt' or '12pt').
-latex_font_size = '10pt'
+latex_elements['font_size'] = '10pt'
 
 # Grouping the document tree into LaTeX files. List of tuples
 # (source start file, target name, title, author, document class [howto/manual]).
@@ -119,30 +132,15 @@
                        for fn in os.listdir('howto')
                        if fn.endswith('.rst') and fn != 'index.rst')
 
-# Additional stuff for the LaTeX preamble.
-latex_preamble = r'''
-\authoraddress{
-  \strong{Python Software Foundation}\\
-  Email: \email{docs@python.org}
-}
-\let\Verbatim=\OriginalVerbatim
-\let\endVerbatim=\endOriginalVerbatim
-'''
-
 # Documents to append as an appendix to all manuals.
 latex_appendices = ['glossary', 'about', 'license', 'copyright']
 
-# Get LaTeX to handle Unicode correctly
-latex_elements = {'inputenc': r'\usepackage[utf8x]{inputenc}', 'utf8extra': ''}
-
-
 # Options for Epub output
 # -----------------------
 
 epub_author = 'Python Documentation Authors'
 epub_publisher = 'Python Software Foundation'
 
-
 # Options for the coverage checker
 # --------------------------------