update helps for abstractions

pd/abs/2d/additive.pd

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pd/abs/p.mdap-help.pd

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pd/abs/p.vbap-help.pd

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 #X text 10 34 An abstraction that computes the gains of a set of loudspeakers
 for the spatialization of a virtual source using V. Pulkki's Vector
 Base Amplitude Panning technique., f 90;
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