Fix typo

doc/src/sgml/datatype.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.252 2010/07/24 12:17:35 petere Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/datatype.sgml,v 1.253 2010/07/24 16:46:57 petere Exp $ -->
 
  <chapter id="datatype">
   <title>Data Types</title>
@@ -2781,7 +2781,7 @@ P <optional> <replaceable>years</>-<replaceable>months</>-<replaceable>days</> <
       <row>
        <entry><type>boolean</type></entry>
        <entry>1 byte</entry>
-       <entry>state of true of false</entry>
+       <entry>state of true or false</entry>
       </row>
      </tbody>
     </tgroup>