Misspell behaviour on purpose

Author: zoffixznet

doc/Type/Iterator.pod6

@@ -23,7 +23,7 @@ overridden for performance reasons.
 
 Iterators only allow one iteration over the entire sequence. It's forbidden
 to make attempts to fetch more data, once C<IterationEnd> has been generated,
-and behaviour for doing so is undefed. For example, the following L<Seq>
+and behavior for doing so is undefed. For example, the following L<Seq>
 will not cause the L<die> to be called under normal use, because
 L<pull-one> will never be called after it returns C<IterationEnd>: