fix various doc typos #3320
diff --git a/Doc/library/tix.rst b/Doc/library/tix.rst
index dea88fa..8b5355d 100644
--- a/Doc/library/tix.rst
+++ b/Doc/library/tix.rst
@@ -310,8 +310,8 @@
 .. \ulink{FileEntry}{http://tix.sourceforge.net/dist/current/demos/samples/FileEnt.tcl}
 
 
-Hierachical ListBox
-^^^^^^^^^^^^^^^^^^^
+Hierarchical ListBox
+^^^^^^^^^^^^^^^^^^^^
 
 
 .. class:: HList()