Docs around expect_recipe() are probably wrong as of Chef 12.4

[randomcamel]

chef-boneyard/chef-provisioning-aws#250 and #52 indicate that the behavior of expect_recipe

• may be different from what the README says, and
• may differ between Chef 12.3 and 12.4.

[randomcamel]

The same specs for expect_recipe pass for 12.3 and 12.4, so we'll have to look at that and add stuff if there's really a discrepancy.