Issue #26778: Fixed "a/an/and" typos in code comment and documentation.
diff --git a/Doc/library/tix.rst b/Doc/library/tix.rst
index a2f31a0..8626cd8 100644
--- a/Doc/library/tix.rst
+++ b/Doc/library/tix.rst
@@ -276,7 +276,7 @@
 
    The `ExFileSelectBox
    <http://tix.sourceforge.net/dist/current/man/html/TixCmd/tixExFileSelectBox.htm>`_
-   widget is usually embedded in a tixExFileSelectDialog widget. It provides an
+   widget is usually embedded in a tixExFileSelectDialog widget. It provides a
    convenient method for the user to select files. The style of the
    :class:`ExFileSelectBox` widget is very similar to the standard file dialog on
    MS Windows 3.1.