fix various doc typos #3320
diff --git a/Doc/library/imputil.rst b/Doc/library/imputil.rst
index 6a50b7a..09a41f6 100644
--- a/Doc/library/imputil.rst
+++ b/Doc/library/imputil.rst
@@ -108,7 +108,7 @@
 This code is intended to be read, not executed.  However, it does work
 -- all you need to do to enable it is "import knee".
 
-(The name is a pun on the klunkier predecessor of this module, "ni".)
+(The name is a pun on the clunkier predecessor of this module, "ni".)
 
 ::