Documentation - Audio Channels (Incomprehensible?)

This is the page here:

“Audio Channel Mapping in Premiere Pro” 

Issues:

“To enable or disable an audio channel, select or deselect the Enable option for a source channel.”
I think the “Enable option” is intended to mean check boxes? The check boxes correspond to both source channels and output channels (not just source channels).

“When you view a clip with remapped source channels in a Timeline panel, the tracks appear in ascending order. However, the mapping determines their associated source channels.”
I have no idea what is intended by these statements. Maybe this isintended to describe channel labelling on clips in tracks in the timeline. Perhaps there is a conflation of “tracks” and “channels” here - taken at face value, this statement is saying that the source channels on a given timeline track are determined by mapping. Strictly speaking this is true, but the statement actually isn’t clarifying anything. (Also "ascending order" is a questionable way to describe the way tracks - or channels - appear in the timeline since track 1 is at the top)

“To map a source channel to a different output track or channel, drag a track or channel icon to another source channel row. This step swaps the output channels or tracks for the two source channels.”
An explanation is needed of what a “channel icon” is and how to drag it.
There are non-draggable channels listed and non-draggable check boxes but no “channel icons”.

Break all stereo tracks into mono tracks
Choose Edit > Preferences > Audio
In the Source Channel Mapping area, choose Mono from the Stereo Media menu.
No "channel mapping" area exists here.

But really there's a fundamental problem with this page in that it doesn't address how clip channels interact with timeline channels interact with hardware channels - all this must be inferred.

R.