small changes before CRAN submission

Author: nteetor

tests/testthat/test-pipe.R

@@ -1,7 +1,7 @@
 context(' * testing %>% expressions')
 
 test_that('%<-% and %>% caveat', {
-  skip('must wrap piped expressions in parentheses')
+  skip('must wrap piped expressions in parentheses or use right operator')
 })
 
 test_that('%<-% assign magrittr chain vector', {

vignettes/unpacking-assignment.Rmd

@@ -342,7 +342,7 @@ y
 ```
 
 However, if we tried to get 3 elements and assign them an error would be raised
-because `tail(nums, 3)` still only returns 2 values.
+because `tail(nums, 3)` still returns only 2 values.
 
 ```{r, error = TRUE}
 c(x, y, z) %<-% tail(nums, 3)
@@ -385,7 +385,7 @@ fish
 
 ## Right operator
 The `magrittr` package provides a pipe operator `%>%` which allows functions
-to be chained together in succession instead of nested. The left operator `%<-%`
+to be called in succession instead of nested. The left operator `%<-%`
 does not work well with these function chains. Instead, the right operator
 `%->%` is recommended. The below example is adapted from the `magrittr` readme.