pythongh-106310 - document the __signature__ attribute (pythonGH-106311)

Document the __signature__ attribute

(cherry picked from commit b07f232)

Co-authored-by: Gouvernathor <44340603+Gouvernathor@users.noreply.github.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>

Doc/library/inspect.rst

@@ -619,6 +619,9 @@ function.
    Accepts a wide range of Python callables, from plain functions and classes to
    :func:`functools.partial` objects.
 
+   If the passed object has a ``__signature__`` attribute, this function
+   returns it without further computations.
+
    For objects defined in modules using stringized annotations
    (``from __future__ import annotations``), :func:`signature` will
    attempt to automatically un-stringize the annotations using
@@ -738,6 +741,8 @@ function.
          sig = MySignature.from_callable(min)
          assert isinstance(sig, MySignature)
 
+       Its behavior is otherwise identical to that of :func:`signature`.
+
        .. versionadded:: 3.5
 
        .. versionadded:: 3.10