KLC: Document how galvanic isolation should be indicated

[antoniovazquezblanco]

From KiCad/kicad-symbols#429

Most of the librarians seem to agree that adding galvanic isolation lines is a positive thing for the schematic symbols library.

Components should indicate galvanic isolation by means of vertically dashed lines. Current style consensus seems to be summarized in KiCad/kicad-symbols#429 (comment).

In the thread example images can be found.

[antoniovazquezblanco]

Currently two different styles coexist in the library. Please, @poeschlr pick the one you like the most:

One liner:

Two lines:

Thank you very much.

[poeschlr]

I don't have a particular preference for any of them.
Lets take the one with more symbols (meaning less work)

[antoniovazquezblanco]

Data from KiCad/kicad-symbols#429 (comment)

There are more symbols with a single line.

Thanks