cast.Rd documentation error

[rmcd1024]

cast.Rd refers to margin options that are apparently deprecated:

item{margins}{vector of variable names (can include "grand_col" and
"grand_row") to compute margins for, or TRUE to compute all margins .
Any variables that can not be margined over will be silently dropped.}

Suggested change:

item{margins}{vector of variable names (if TRUE compute all margins) for which to compute margins. Any variables that cannot be margined over will be silently dropped.}