doc: remove duplicate 1.6 version menu choice
@@ -191,7 +191,6 @@ html_context = {
'versions': ( ("latest", "/latest/"),
("1.6.1", "/1.6.1/"),
("1.6", "/1.6/"),
- ("1.6", "/1.6/"),
("1.5", "/1.5/"),
("1.4", "/1.4/"),
("1.3", "/1.3/"),
