PEP 695: Use an unquoted forward reference in the type alias example - #5153

The forward-reference example quotes Vegetable inside a | union. When the alias value is evaluated with ordinary classes, Animal | "Vegetable" raises TypeError. Use the unquoted name and link to the existing lazy-evaluation explanation so the example also works when inspected at runtime.

This clarifies the example without changing the specified semantics. For example, this succeeds on CPython 3.12 through 3.15:

type AnimalOrVegetable = Animal | Vegetable

class Animal:
    pass

class Vegetable:
    pass

assert AnimalOrVegetable.__value__ == Animal | Vegetable

Validation: the example passes on CPython 3.12.12, 3.13.13, 3.14.4, 3.14.7, and 3.15.0rc2. All pre-commit checks applicable to peps/pep-0695.rst pass. Generated the HTML and verified the updated example and local Lazy Evaluation link. The strict Sphinx build reports warnings because all six docs.python.org inventories return HTTP 503, leaving existing external cross-references unresolved.

• Change is either:
  • To a Draft PEP
  • To an Accepted or Final PEP, with Steering Council approval
  • To fix an editorial issue (markup, typo, link, header, etc)
• PR title prefixed with PEP number (e.g. PEP 123: Summary of changes)