Remove duplicate comment.
diff --git a/docs/conf.py b/docs/conf.py
index 7185c41d2e..f7dcafc10f 100644
--- a/docs/conf.py
+++ b/docs/conf.py
@@ -133,7 +133,6 @@
 # typographically correct entities.
 #html_use_smartypants = True
 
-# Custom sidebar templates, maps document names to template names.
 # Custom sidebar templates, maps document names to template names.
 html_sidebars = {
     'index':    ['sidebarintro.html', 'sourcelink.html', 'searchbox.html'],
