Improve Text Format Admin Description

To be found at /admin/settings/formats
OMG, this text is a total mess.

It is hard to even start quoting where it fails. It talks about user permissions, the format selection widget below the main text area in node forms, the order you have to arrange it - uff.

This must be reworked in order to enable an amin persona to understand what text formats are for: they are actually quite powerful in Drupal and can present a serious security threat if set wrongly.