textrecipes: Extra 'Recipes' for Text Processing

#' tunable methods for textrecipes
#'
#' These functions define what parameters _can_ be tuned for specific steps.
#'  They also define the recommended objects from the `dials` package that can
#'  be used to generate new parameter values and other characteristics.
#' @param x A recipe step object
#' @param ... Not used.
#' @name tunable_textrecipes
#' @return A tibble object.
#' @keywords internal
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