Fix typo.

Thomas Munro

Discussion: http://postgr.es/m/CAEepm=3vV1YKxDfLMqq-nYM2fN+STMYLwPKFCoah4M0gxqqNNg@mail.gmail.com

doc/src/sgml/trigger.sgml

@@ -123,7 +123,7 @@
    </para>
 
    <para>
-    A statement that targets a parent table in a inheritance or partitioning
+    A statement that targets a parent table in an inheritance or partitioning
     hierarchy does not cause the statement-level triggers of affected child
     tables to be fired; only the parent table's statement-level triggers are
     fired.  However, row-level triggers of any affected child tables will be