fix emtrends typo

Author: jpiaskowski

R/emtrends.R

@@ -66,12 +66,11 @@
 #'   dataset.
 #' @param max.degree Integer value. The maximum degree of trends to compute (this
 #'   is capped at 5). If greater than 1, an additional factor \code{degree} is
-#'   added to the grid, with corresponding numerical derivatives of orders
-#'   \code{1, 2, ..., max.degree} as the estimates. The estimates at \code{var = x0} are 
-#' equal to the coefficients of \eqn{(x – x0)^degree} based on interpolating over
-#' the \eqn{degree + 1} fitted values centered at \eqn{x0} and spaced \eqn{h} apart.
+#'   added to the grid, with corresponding levels for orders
+#'   \code{1, 2, ..., max.degree}. The estimates at \eqn{\mathtt{var} = x_0} are 
+#' equal to the coefficients of \eqn{(x – x_0)^{degree}} based on interpolating over
+#' the \eqn{degree + 1} fitted values centered at \eqn{x_0} and spaced \eqn{h} apart.
 #' These are also known as Newton divided differences.
-
 #' @param ... Additional arguments passed to \code{\link{ref_grid}} or 
 #'   \code{\link{emmeans}} as appropriate. See Details.
 #'