Clarify meaning of second DateStyle value.

doc/src/sgml/runtime.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.258 2004/04/07 05:05:49 momjian Exp $
+$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.259 2004/04/15 04:46:18 momjian Exp $
 -->
 
 <Chapter Id="runtime">
@@ -2433,17 +2433,18 @@ SET ENABLE_SEQSCAN TO OFF;
       <indexterm><primary>date style</></>
       <listitem>
        <para>
-        Sets the display format for date and time values, as well as
-        the rules for interpreting ambiguous date input values.
-        For historical reasons, this variable contains two independent
+        Sets the display format for date and time values, as well as the
+        rules for interpreting ambiguous date input values. For
+        historical reasons, this variable contains two independent
         components: the output format specification (<literal>ISO</>,
-        <literal>Postgres</>, <literal>SQL</>, or <literal>German</>) and
-        the date field order specification (<literal>DMY</>, <literal>MDY</>,
-        or <literal>YMD</>).  These can be set separately or together.
-        The keywords <literal>Euro</> and <literal>European</> are synonyms
-        for <literal>DMY</>; the keywords <literal>US</>, <literal>NonEuro</>,
-        and <literal>NonEuropean</> are synonyms for <literal>MDY</>.
-        See <xref linkend="datatype-datetime"> for more information.  The
+        <literal>Postgres</>, <literal>SQL</>, or <literal>German</>)
+        and the input/output specification for year/month/day ordering
+        (<literal>DMY</>, <literal>MDY</>, or <literal>YMD</>). These
+        can be set separately or together. The keywords <literal>Euro</>
+        and <literal>European</> are synonyms for <literal>DMY</>; the
+        keywords <literal>US</>, <literal>NonEuro</>, and
+        <literal>NonEuropean</> are synonyms for <literal>MDY</>. See
+        <xref linkend="datatype-datetime"> for more information. The
         default is <literal>ISO, MDY</>.
        </para>
       </listitem>