I found an inaccuracy in Function_Reference/get_bloginfo:
'wpurl' / 'siteurl' - Returns the 'WordPress address (URI)' set in Settings > General.
'siteurl' returns the 'Site address (URI)' setting.
I don't want to get all involved in contributing to the Codex; I'm just getting started with WP. Maybe someone who is into that stuff will see this and make an edit. :)