Update create.scatterplot documentation

[forbiddenpersimmon]

Description

Updated create.scatterplot type parameter documentation to be more descriptive from just "Plot type". Includes commonly used elements for this parameter and points to xyplot documentation for more information.

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[jarbet]

This is very helpful, I always wondered what all the accepted values were. Thanks @forbiddenpersimmon !

[forbiddenpersimmon]

Love this. I've always wondered, are these values directly from lattice?

Yeah these come directly from lattice's xyplot()