bpo-45655: Add ref to union type expressions at top of typing docs (GH-29309)

(cherry picked from commit d9575218d7)

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
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@ -61,7 +61,8 @@ annotations. These include:
*Introducing* :data:`Annotated`
* :pep:`604`: Allow writing union types as ``X | Y``
*Introducing* :data:`types.UnionType` and the ability to use
the binary-or operator ``|`` as syntactic sugar for a union of types
the binary-or operator ``|`` to signify a
:ref:`union of types<types-union>`
* :pep:`612`: Parameter Specification Variables
*Introducing* :class:`ParamSpec` and :data:`Concatenate`
* :pep:`613`: Explicit Type Aliases