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Document typing.ForwardRef (GH-14216)

(cherry picked from commit809ff11)Co-authored-by: Ivan Levkivskyi <levkivskyi@gmail.com>

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Original file line number	Diff line number	Diff line change
`@@ -1001,6 +1001,13 @@ The module defines the following classes, functions and decorators:`
`1001`	`1001`
`1002`	`1002`	`..versionadded::3.8`
`1003`	`1003`
	`1004`	`+..class::ForwardRef`
	`1005`	`+`
	`1006`	`+ A class used for internal typing representation of string forward references.`
	`1007`	+ For example, ``List["SomeClass"]`` is implicitly transformed into
	`1008`	+ ``List[ForwardRef("SomeClass")]``. This class should not be instantiated by
	`1009`	`+ a user, but may be used by introspection tools.`
	`1010`	`+`
`1004`	`1011`	`..function::NewType(typ)`
`1005`	`1012`
`1006`	`1013`	`A helper function to indicate a distinct types to a typechecker,`

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