Editing B3U-1000P-B - add pin info

[Lawproto]

Description	Field
Category	ECAD
Alias Creo	[title]
IIT-Code	15123
Applicant	Lorenzo Protopapa, @Lawproto
Supervisor	Luca Fiorio, @fiorisi
Maintainer	Marcello Savoldi, @marcellosavoldi
Coworkers	@icub-tech-iit/silo-mech

Description and motivation of the changing request:

As reported by @maurizbo, there is a pegullo to be added.

Checklist:

• Converted the files with the EDU-COM license.
• Checked that the associated WINGST code is up-to-date and that the manufacturer and at least one supplier are defined.