Clarify that the expression is regular math notation, not Python. (GH-96903) (GH-96908)

Author: miss-islington

Doc/library/math.rst

@@ -45,8 +45,8 @@ Number-theoretic and representation functions
    to zero when ``k > n``.
 
    Also called the binomial coefficient because it is equivalent
-   to the coefficient of k-th term in polynomial expansion of the
-   expression ``(1 + x) ** n``.
+   to the coefficient of k-th term in polynomial expansion of
+   ``(1 + x)ⁿ``.
 
    Raises :exc:`TypeError` if either of the arguments are not integers.
    Raises :exc:`ValueError` if either of the arguments are negative.