bpo-44072: fix Complex, Integral docs for `**` (GH-25986)

In numbers module docstrings and docs.

Doc/library/numbers.rst

@@ -27,8 +27,8 @@ The numeric tower
    Subclasses of this type describe complex numbers and include the operations
    that work on the built-in :class:`complex` type. These are: conversions to
    :class:`complex` and :class:`bool`, :attr:`.real`, :attr:`.imag`, ``+``,
-   ``-``, ``*``, ``/``, :func:`abs`, :meth:`conjugate`, ``==``, and ``!=``. All
-   except ``-`` and ``!=`` are abstract.
+   ``-``, ``*``, ``/``, ``**``, :func:`abs`, :meth:`conjugate`, ``==``, and
+   ``!=``. All except ``-`` and ``!=`` are abstract.
 
    .. attribute:: real
 
@@ -76,8 +76,9 @@ The numeric tower
 
    Subtypes :class:`Rational` and adds a conversion to :class:`int`.  Provides
    defaults for :func:`float`, :attr:`~Rational.numerator`, and
-   :attr:`~Rational.denominator`.  Adds abstract methods for ``**`` and
-   bit-string operations: ``<<``, ``>>``, ``&``, ``^``, ``|``, ``~``.
+   :attr:`~Rational.denominator`.  Adds abstract methods for :func:`pow` with
+   modulus and bit-string operations: ``<<``, ``>>``, ``&``, ``^``, ``|``,
+   ``~``.
 
 
 Notes for type implementors

Lib/numbers.py

@@ -33,7 +33,7 @@ class Complex(Number):
     """Complex defines the operations that work on the builtin complex type.
 
     In short, those are: a conversion to complex, .real, .imag, +, -,
-    *, /, abs(), .conjugate, ==, and !=.
+    *, /, **, abs(), .conjugate, ==, and !=.
 
     If it is given heterogeneous arguments, and doesn't have special
     knowledge about them, it should fall back to the builtin complex
@@ -292,7 +292,11 @@ def __float__(self):
 
 
 class Integral(Rational):
-    """Integral adds a conversion to int and the bit-string operations."""
+    """Integral adds methods that work on integral numbers.
+
+    In short, these are conversion to int, pow with modulus, and the
+    bit-string operations.
+    """
 
     __slots__ = ()
 

Misc/NEWS.d/next/Documentation/2021-05-08-09-48-05.bpo-44072.fb2x5I.rst

@@ -0,0 +1,2 @@
+Correct where in the numeric ABC hierarchy ``**`` support is added, i.e., in
+numbers.Complex, not numbers.Integral.