[CodeQuality] Deprecate NarrowUnionTypeDocRector as focused on docblocks, and moving to type declarations #3848
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In Rector 0.15 we've added safe type declarations in property, param and return types. This required splitting many rules to smaller strict ones.
I've just noticed we've forgot to handle the union types as well, this PR is fixing it 👍
Follow up to #3846
See https://getrector.com/blog/new-in-rector-015-complete-safe-and-known-type-declarations