Fix param name (#5415)

* Fix small typo
tidyverse · Jul 31, 2020 · 76779fb · 76779fb
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diff --git a/R/arrange.R b/R/arrange.R
@@ -5,7 5,7 @@
 #' columns.
 #'
 #' Unlike other dplyr verbs, `arrange()` largely ignores grouping; you
-#' need to explicitly mention grouping variables (or use `by_group = TRUE`)
 #' need to explicitly mention grouping variables (or use `.by_group = TRUE`)
 #' in order to group by them, and functions of variables are evaluated
 #' once per data frame, not once per group.
 #'

diff --git a/man/arrange.Rd b/man/arrange.Rd