Update phpdoc for register_post_type()
|Reported by:||jeremyfelt||Owned by:||ryan|
The phpdoc for register_post_type() can often be a source of confusion in its current state.
This patch cleans things up and attempts to better clarify the arguments without going in to too much detail.
A refresh to Codex has also just been made to reflect the clarifications made in this patch - http://codex.wordpress.org/Function_Reference/register_post_type