* Fixup keyword dumping
* Clarify introductory text
* Turn links in the keyword description into seealso entries in the rst.
* Have plugin_formatter cleanup trailing whitespace
The indent filter in jinja2 < 2.10 indents blank lines by default which
leads to trailing whitespace. Cleanup after that filter.
* Edits
* Copy edit
- old functionality is still available direct lookup use, the following are equivalent
with_nested: [[1,2,3], ['a','b','c']]
loop: "{{lookup('nested', [1,2,3], ['a','b','c'])}}"
- avoid squashing with 'loop:'
- fixed test to use new intenal attributes
- removed most of 'lookup docs' as these now reside in the plugins
* Use a rst glossary for playbooks_keywords docs
* Add a 'Task' and 'Tasks' to glossary.
* Update keywords desciptions,
* use :term: rst ref, some quoting
* Make it more obvious that 'retries' and 'until' need to be used in combination.
