`base-4.18.0.0` (GHC 9.6.1-alpha1) changelog inaccuracies

The changelog entry for base-4.18 claims the following:

Add Data.List.!? per CLC proposal #110.

maximumBy/minimumBy are now marked as INLINE improving performance for unpackable types significantly.

These changelog additions were added in the respective commits:

Add safe list indexing operator: !? (d53f6f4d)
Mark maximumBy/minimumBy as INLINE. (6abea760)

As far as I can tell, however, these commits are not present on the ghc-9.6 branch nor in GHC 9.6.1-alpha1. I'm not sure if they are meant to be backported to the ghc-9.6 branch or not. If not, please move these changelog additions to a new section.

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