翻译PG11 contrib.sgml

Author: ChenHuajun

postgresql/doc/src/sgml/contrib.sgml

@@ -122,7 +122,7 @@ CREATE EXTENSION <replaceable>module_name</replaceable>;
   choice.  To do that, add <literal>SCHEMA
   <replaceable>schema_name</></literal> to the <command>CREATE EXTENSION</>
   command.  By default, the objects will be placed in your current creation
-  target schema, typically <literal>public</>.
+  target schema, which in turn defaults to <literal>public</literal>.
  </para>
 ____________________________________________________________________________-->
  <para>