`` in text was triggering warning of inline literal from sphinx.

Change to ''.

Author: rouilj

COPYING.txt

@@ -84,7 +84,7 @@ following conditions are met:
 
 Disclaimer
 
-  THIS SOFTWARE IS PROVIDED BY ZOPE CORPORATION ``AS IS''
+  THIS SOFTWARE IS PROVIDED BY ZOPE CORPORATION ''AS IS''
   AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
   NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
   AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN