ARROW-11079: [R] Catch up on changelog since 2.0
ARROW-11079: [R] Catch up on changelog since 2.0

Closes #9050 from nealrichardson/backfill-news

Authored-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>
Signed-off-by: Neal Richardson <beb59f0141269d2d04e73d0dcc1967b64ba87e13@gmail.com>

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