Schematic is missing ground plane for +5V voltage regulator

[Roger-random]

Schematic diagram is missing the ground plane for +5V voltage regulator. There's no connection to battery negative, and no connection to Raspberry Pi ground plane.

Spotted by [Jeffery Reedy], thanks Jeff!

A text warning errata has been added to the documentation just below the schematic. This issues tracks the need to replace the flawed schematic diagram with a corrected one.