Customizing Horizon doc needs to be cleaned up

[Cindy Lu]

http://docs.openstack.org/developer/horizon/topics/customizing.html

Still refers to horizon.less file.

"To add icon to Table Action, use icon property. Example:

class CreateSnapshot(tables.LinkAction):
name = “snapshot” verbose_name = _(“Create Snapshot”) icon = “camera”"

This should be formatted so that each attribute is on a new line.

Possibly run through the tutorial to make sure everything works?

[David Lyle (david-lyle)]

There was a rework of the tutorial that covered this.