fix trailing whitespace
diff --git a/Doc/library/xml.etree.elementtree.rst b/Doc/library/xml.etree.elementtree.rst
index 51ff1ee..335a6e2 100644
--- a/Doc/library/xml.etree.elementtree.rst
+++ b/Doc/library/xml.etree.elementtree.rst
@@ -767,7 +767,7 @@
:class:`Element` structure builder for XML source data, based on the expat
parser. *html* are predefined HTML entities. This flag is not supported by
the current implementation. *target* is the target object. If omitted, the
- builder uses an instance of the standard :class:`TreeBuilder` class.
+ builder uses an instance of the standard :class:`TreeBuilder` class.
*encoding* [1]_ is optional. If given, the value overrides the encoding
specified in the XML file.