GH-38904:[R] Update news.md for 14.0.0.2

[assignUser]

Rationale for this change

Update news.md

Are these changes tested?

no

• Closes: [R] Update R News for 14.0.2 #38904

[github-actions]

⚠️ GitHub issue #38904 has been automatically assigned in GitHub to PR creator.

[paleolimbot]

Thanks!

[conbench-apache-arrow]

After merging your PR, Conbench analyzed the 6 benchmarking runs that have been run so far on merge-commit ce27b8c.

There were 2 benchmark results indicating a performance regression:

• Commit Run on ursa-i9-9960x at 2023-12-02 03:11:14Z
  • tpch (R) with engine=arrow, format=native, language=R, memory_map=False, query_id=TPCH-18, scale_factor=1
  • file-read (R) with compression=uncompressed, dataset=nyctaxi_2010-01, file_type=feather, language=R, output_type=table

The full Conbench report has more details. It also includes information about 11 possible false positives for unstable benchmarks that are known to sometimes produce them.