- Use "contains" rather than "returns" to describe tests of objects or
   object properties

 - Avoid deeply nested `describe` blocks that only contain a single test. This
   is just a preference not to have too many levels of nesting unless
   there are tests that benefit from grouping.

 - Revise description of tests for link properties (`link`,
   `documentFingerprint`, `favicon`) since these cover properties other
   than just `link`.