Change 'serial' dual diodes to 'series'

[evanshultz]

This is a followup to https://github.com/KiCad/kicad-symbols/pull/2980, which was a followup to https://github.com/KiCad/kicad-symbols/pull/1650. I only changed a dozen dual diode symbols from having Serial in the symbol name to Series. I made sure to save before making changes and there were none, but unfortunately the Git diff makes things look more confusing than just that simple symbol name change.

@chschlue You merged https://github.com/KiCad/kicad-symbols/pull/2980 so do you mind?

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[evanshultz]

Good catch. I think that should be all of them.