[TomasVotruba]

Two rules mutate the AST in place and then return null on the mutating branch. With the rector-src engine change in rectorphp/rector-src#8791, a pass that records no change skips the format-preserving print, so these in-place mutations are now dropped from output. The fix returns the already-mutated node so the change is reported through the refactor() return value. Output is unchanged; only the return value changes.

Rules fixed:

• ArrayMapOnCollectionToArrayRector - the array_filter branch called refactorArrayFilter() (which rewrites the first arg in place) but discarded its return and fell through to return null. Now returns the result.
• CollectionDocblockGenericTypeRector - adds a generic @return tag and calls updateRefactoredNodeWithPhpDocInfo() on the node, then returned null. Now returns the mutated node.

Tested green against both rector-src main and the rectorphp/rector-src#8791 branch (306 tests).