Simplification of the HTML class name in Zend\Tag\Cloud\Decorator\HtmlCloud

Changed from "Zend&#x5C;Tag&#x5C;Cloud" to "zend-tag-cloud"
Fixes additional unit tests for Zend\Tag\Cloud
Merge pull request #4822 from froschdesign/hotfix/zend-tag-cloud

Simplification of the HTML class name in Tag\Cloud\Decorator\HtmlCloud
[#4822] CS

- If we're going to make readability changes, let's make them consistent
  with the rest of the framework:
  - array arguments should all have commas following each entry
  - array arguments as sole argument of a method can open on same line
    as call; indentation then adjusts one level less
- Use `assertInstanceOf` throughout, instead of `assertTrue($a instanceof $b)`
- While the `setExpectedException()` lines get a little long, they're
  not unreadable; breaking them into multiple lines makes intent less
  clear.
Merge branch 'feature/4822' into develop

Close #4822