Mention "syntax" error as not logged by log_statement.

Backpatch.

doc/src/sgml/config.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.53 2006/04/18 00:52:22 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.54 2006/04/18 12:41:15 momjian Exp $ -->
 
 <chapter Id="runtime-config">
   <title>Server Configuration</title>
@@ -2759,7 +2759,7 @@ SELECT * FROM parent WHERE key = 2400;
         <para>
          The <command>EXECUTE</command> statement is not considered a
          <literal>ddl</> or <literal>mod</> statement.  Statements that
-         generate errors are not logged.  Set
+         generate syntax errors are not logged.  Set
          <varname>log_min_error_statement</> to <literal>error</> to
          log such statements.      
         </para>