Check the upgrade guide

Changelog

• bug #5560 PSR2: require visibility only for properties and methods (kubawerlos)
• bug #5561 NoMixedEchoPrintFixer: fix for conditions without curly brackets (kubawerlos)
• bug #5563 Priority fix: SingleSpaceAfterConstructFixer must run before BracesFixer (kubawerlos)
• bug #5567 Fix order of BracesFixer and ClassDefinitionFixer (Daeroni)
• bug #5576 ClassAttributesSeparationFixer: do not allow using v2 config (kubawerlos)
• bug #5596 NullableTypeTransformer - fix for attributes (kubawerlos, jrmajor)
• bug #5598 GroupImportFixer - fix breaking code when fixing root classes (Leprechaunz)
• minor #5555 DX: further typing improvements (keradus)
• minor #5562 Fix table row rendering for default values of array_syntax and list_syntax (derrabus)
• minor #5571 DX: add test to make sure SingleSpaceAfterConstructFixer runs before FunctionDeclarationFixer (kubawerlos)
• minor #5577 Extend priority test for "class_definition" vs "braces" (kubawerlos)
• minor #5585 DX: make doc examples prettier (kubawerlos)
• minor #5590 Docs: HeaderCommentFixer - document example how to remove header comment (keradus)
• minor #5602 DX: regenerate docs (keradus)