Update code in the documentation

• Fix first example error #428:
  Just newVal instead of newValue.target.message in the first example

• types.propDefinition.md: Fix SETTER code example #429:
  Fix docs SETTER first example at the line 6 should use newVal as argument

• Update defaultConstructor.md #430:
  Use default instead of value

• Update TypeConstructor.md #431:
  Import "Person" type from can-demo-models

• Update define-map.md #432:
  replace ":" by ";" in Declarative properties section