correction to help file for geom_shadowtext

[Jacob Cram]

I think that in the geom_shadowtext.Rd file, in the example given one should call for bg.color rather than bgcolor, as the later is not recognized by shadowtext. Currently, the example leaves the background color as default.

that is, I think the author should replace

ggplot(d, aes(x,y)) + geom_shadowtext(aes(label=label, color=label), bgcolor='firebrick')

with

ggplot(d, aes(x,y)) + geom_shadowtext(aes(label=label, color=label), bg.color='firebrick')

[Guangchuang Yu]

thanks