Fix name of argument in docs for functools.reduce(). (#9634)

Author: direvus

Doc/library/functools.rst

@@ -280,14 +280,14 @@ The :mod:`functools` module defines the following functions:
 
 .. function:: reduce(function, iterable[, initializer])
 
- Apply *function* of two arguments cumulatively to the items of *sequence*, from
- left to right, so as to reduce the sequence to a single value. For example,
+ Apply *function* of two arguments cumulatively to the items of *iterable*, from
+ left to right, so as to reduce the iterable to a single value. For example,
  ``reduce(lambda x, y: x+y, [1, 2, 3, 4, 5])`` calculates ``((((1+2)+3)+4)+5)``.
  The left argument, *x*, is the accumulated value and the right argument, *y*, is
- the update value from the *sequence*. If the optional *initializer* is present,
- it is placed before the items of the sequence in the calculation, and serves as
- a default when the sequence is empty. If *initializer* is not given and
- *sequence* contains only one item, the first item is returned.
+ the update value from the *iterable*. If the optional *initializer* is present,
+ it is placed before the items of the iterable in the calculation, and serves as
+ a default when the iterable is empty. If *initializer* is not given and
+ *iterable* contains only one item, the first item is returned.
 
  Roughly equivalent to::