Add more entries to the glossary.

Written by Jeff Wheeler for GHOP.
diff --git a/Doc/library/doctest.rst b/Doc/library/doctest.rst
index 88ccb86..acc8d1b 100644
--- a/Doc/library/doctest.rst
+++ b/Doc/library/doctest.rst
@@ -1135,7 +1135,8 @@
 The advanced API revolves around two container classes, which are used to store
 the interactive examples extracted from doctest cases:
 
-* :class:`Example`: A single python statement, paired with its expected output.
+* :class:`Example`: A single python :term:`statement`, paired with its expected
+  output.
 
 * :class:`DocTest`: A collection of :class:`Example`\ s, typically extracted
   from a single docstring or text file.