Update NEWS.md

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NEWS.md

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 MixedModels v4.30.0 Release Notes
 ==============================
 - Refactor calls to backend optimizer to make it easier to add and use different optimization backends.
-  The structure of `OptSummary` has been accordlingly expanded and `prfit!` has been updated to use this new structure. [#802]
+  The structure of `OptSummary` has been accordingly expanded and `prfit!` has been updated to use this new structure. [#802]
 - Make the `thin` argument to `fit!` a no-op. It complicated several bits of logic without having any real performance benefit in the majority of cases. This argument has been replaced with a `fitlog::Bool=false` that determines whether a log is kept.[#802]