Fix file name.

This test case was accidentally reusing a previous template.

slapos/recipe/template/README.jinja2.txt

@@ -220,7 +220,7 @@ You can specify the umask for rendered file::
     ...
     ... [template]
     ... recipe = slapos.recipe.template:jinja2
-    ... template = foo.in
+    ... template = template.in
     ... rendered = foo
     ... context = key bar buildout:parts
     ... umask = 570