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[3.13] gh-142965: Fix Concatenate documentation to reflect valid use cases (GH-143316) (#148900)

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The documentation previously stated that Concatenate is only valid
when used as the first argument to Callable, but according to PEP 612,
it can also be used when instantiating user-defined generic classes
with ParamSpec parameters.
(cherry picked from commit 75ff1afcb6)

Co-authored-by: John Seong <39040639+sandole@users.noreply.github.com>
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Doc/library/typing.rst
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@ -1166,7 +1166,8 @@ These can be used as types in annotations. They all support subscription using
or transforms parameters of another
callable. Usage is in the form
``Concatenate[Arg1Type, Arg2Type, ..., ParamSpecVariable]``. ``Concatenate``
is currently only valid when used as the first argument to a :ref:`Callable <annotating-callables>`.
is valid when used in :ref:`Callable <annotating-callables>` type hints
and when instantiating user-defined generic classes with :class:`ParamSpec` parameters.
The last parameter to ``Concatenate`` must be a :class:`ParamSpec` or
ellipsis (``...``).