Documentation Update: add physical connection info

[peteGSX]

Please provide a brief summary of the update being requested:

We need to outline physical wiring connections to the turntable.

If the update relates to an existing page, please provide the link to the page:

Probably a new page on the different wiring options (relay, auto reverser, wipers).

Please provide details of the information that needs to be added, clarified, or corrected:

Just as above, need to help users understand how to connect the wiring to the turntable for bridge track power.

Additional context

Add any other context or screenshots about the documentation request here.

[peteGSX]

Created documentation branch for this: https://github.com/DCC-EX/dcc-ex.github.io/tree/add-physical-connections

[peteGSX]

Closed by https://github.com/DCC-EX/dcc-ex.github.io/pull/233