Update signature style for optional arguments, part 3.
diff --git a/Doc/library/collections.rst b/Doc/library/collections.rst
index e27d89a..c334dc7 100644
--- a/Doc/library/collections.rst
+++ b/Doc/library/collections.rst
@@ -286,7 +286,7 @@
:class:`deque` objects
----------------------
-.. class:: deque([iterable[, maxlen]])
+.. class:: deque([iterable, [maxlen]])
Returns a new deque object initialized left-to-right (using :meth:`append`) with
data from *iterable*. If *iterable* is not specified, the new deque is empty.
@@ -605,7 +605,7 @@
self-documenting code. They can be used wherever regular tuples are used, and
they add the ability to access fields by name instead of position index.
-.. function:: namedtuple(typename, field_names, [verbose], [rename])
+.. function:: namedtuple(typename, field_names, verbose=False, rename=False)
Returns a new tuple subclass named *typename*. The new subclass is used to
create tuple-like objects that have fields accessible by attribute lookup as