arrow

MINOR: [R][Docs] Fix the note about to read timestamp with timezone column from csv (#14413)

Automatic guessing works to timestamp with timezone (of course, it's automatic, so we don't know which type it actually will be).

``` r
tf <- tempfile()
write.csv(data.frame(x = "1970-01-01T12:00:00+12:00"), file = tf, row.names = FALSE)
arrow::read_csv_arrow(tf, col_types = "?", skip = 1, col_names = "x")
#> # A tibble: 1 × 1
#>   x
#>   <dttm>
#> 1 1970-01-01 00:00:00
```

<sup>Created on 2022-10-14 with [reprex v2.0.2](https://reprex.tidyverse.org)</sup>

Authored-by: SHIMA Tatsuya <ts1s1andn@gmail.com>
Signed-off-by: Neal Richardson <neal.p.richardson@gmail.com>