gh-111343: Fix `itertools` docs: `start` arg is optional for `count` (gh-111344)

diff --git a/Doc/library/itertools.rst b/Doc/library/itertools.rst
index 5846d784c88cccd6db7869ae49e7c84ba5ed2af9..f97e7f720ae4e492803274afadac404371aea9de 100644 (file)
--- a/Doc/library/itertools.rst
+++ b/Doc/library/itertools.rst
@@ -41,7 +41,7 @@ operator can be mapped across two vectors to form an efficient dot-product:
 ==================  =================       =================================================               =========================================
 Iterator            Arguments               Results                                                         Example
 ==================  =================       =================================================               =========================================
-:func:`count`       start, [step]           start, start+step, start+2*step, ...                            ``count(10) --> 10 11 12 13 14 ...``
+:func:`count`       [start[, step]]         start, start+step, start+2*step, ...                            ``count(10) --> 10 11 12 13 14 ...``
 :func:`cycle`       p                       p0, p1, ... plast, p0, p1, ...                                  ``cycle('ABCD') --> A B C D A B C D ...``
 :func:`repeat`      elem [,n]               elem, elem, elem, ... endlessly or up to n times                ``repeat(10, 3) --> 10 10 10``
 ==================  =================       =================================================               =========================================