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Rationale for this change
The headers in NEWS.md didn't reflect the versions we actually released. We didn't release an 18.0.0 version of the package and waited for Arrow C++ 18.1.0 to do the first R package release in the 18.x.x series.
What changes are included in this PR?
Update to NEWS.md.
Are these changes tested?
No.
Are there any user-facing changes?
No.