doc/source/conf.py: fix accidental escape sequence within a string.

diff --git a/doc/source/conf.py b/doc/source/conf.py
index 1aeca6672be2c1d69568828dd34caa86fc084b44..efecf1b2b2eb6530fcb10b8ed3b5594e16a01dff 100644 (file)
--- a/doc/source/conf.py
+++ b/doc/source/conf.py
@@ -121,7 +121,7 @@ htmlhelp_basename = 'dunshiredoc'
 # -- Options for LaTeX output ---------------------------------------------
 
 latex_elements = {
-    'preamble' : '\usepackage{amsfonts,amssymb}',
+    'preamble' : r'\usepackage{amsfonts,amssymb}',
     'printindex' : ''
 }