In `tutorial-define.text.asciidoc`, it is stated that the typical index name contains the date as `MM-DD-YYYY`, and then proceeds to give an example of how a log index from May, 2015 would look like: `logstash-2015.05*`, which doesn't match the typical pattern for dates stated above.
This PR changes the date pattern, as to me `YYYY.MM.DD` is more accurate on a world-wide scale.
This overhaul of the docs structure puts Kibana's documentation more
inline with the structure that is used in Elasticsearch. This will help
us better organize the docs going forward as more docs are added.
This also includes a few necessary content changes for 5.0.
