Last round of adapting style of documenting argument default values.
diff --git a/Doc/library/xml.dom.pulldom.rst b/Doc/library/xml.dom.pulldom.rst
index 18b166f..1893fba 100644
--- a/Doc/library/xml.dom.pulldom.rst
+++ b/Doc/library/xml.dom.pulldom.rst
@@ -1,4 +1,3 @@
-
:mod:`xml.dom.pulldom` --- Support for building partial DOM trees
=================================================================
@@ -11,7 +10,7 @@
Object Model representation of a document from SAX events.
-.. class:: PullDOM([documentFactory])
+.. class:: PullDOM(documentFactory=None)
:class:`xml.sax.handler.ContentHandler` implementation that ...
@@ -21,17 +20,17 @@
...
-.. class:: SAX2DOM([documentFactory])
+.. class:: SAX2DOM(documentFactory=None)
:class:`xml.sax.handler.ContentHandler` implementation that ...
-.. function:: parse(stream_or_string[, parser[, bufsize]])
+.. function:: parse(stream_or_string, parser=None, bufsize=None)
...
-.. function:: parseString(string[, parser])
+.. function:: parseString(string, parser=None)
...