Fixes build errors

Author: kennethdyer

source/style-guide.txt

@@ -46,18 +46,15 @@ MongoDB external and internal customers.
 .. toctree::
    :titlesonly:
 
-   .. toctree::
-      :titlesonly:
-
-      /style-guide/quickstart
-      /style-guide/writing/index
-      /style-guide/style/index
-      /style-guide/markup-guidelines
-      /style-guide/terminology/index
-      /style-guide/screenshots/index
-      /style-guide/error-message-guidelines
-      /style-guide/release-notes-guidelines
-      /style-guide/revision-history
+   /style-guide/quickstart
+   /style-guide/writing/index
+   /style-guide/style/index
+   /style-guide/markup-guidelines
+   /style-guide/terminology/index
+   /style-guide/screenshots/index
+   /style-guide/error-message-guidelines
+   /style-guide/release-notes-guidelines
+   /style-guide/revision-history
 
 The |mdbsg| includes material from the following: