doc: fix Latex margins

Adjust the Latex formatting to match Linux v5.13.1:

* add Latex margins
* reformat the code in doc/conf.py to match Linux

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>

doc/conf.py

@@ -351,6 +351,13 @@ latex_elements = {
     'inputenc': '',
     'utf8extra': '',
 
+    # Set document margins
+    'sphinxsetup': '''
+        hmargin=0.5in, vmargin=1in,
+        parsedliteralwraps=true,
+        verbatimhintsturnover=false,
+    ''',
+
     # Additional stuff for the LaTeX preamble.
     'preamble': '''
         % Use some font with UTF-8 support with XeLaTeX
@@ -358,7 +365,7 @@ latex_elements = {
         \\setsansfont{DejaVu Sans}
         \\setromanfont{DejaVu Serif}
         \\setmonofont{DejaVu Sans Mono}
-     '''
+     ''',
 }
 
 # At least one book (translations) may have Asian characters