Add missing close brackets in old-style COPY syntax diagram.

Spotted by Evan Carroll.

doc/src/sgml/ref/copy.sgml

 <!--
-$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.98 2010/04/30 19:49:06 tgl Exp $
+$PostgreSQL: pgsql/doc/src/sgml/ref/copy.sgml,v 1.99 2010/06/17 17:03:57 tgl Exp $
 PostgreSQL documentation
 -->
 
@@ -862,7 +862,7 @@ COPY <replaceable class="parameter">table_name</replaceable> [ ( <replaceable cl
           [ CSV [ HEADER ]
                 [ QUOTE [ AS ] '<replaceable class="parameter">quote</replaceable>' ]
                 [ ESCAPE [ AS ] '<replaceable class="parameter">escape</replaceable>' ]
-                [ FORCE NOT NULL <replaceable class="parameter">column</replaceable> [, ...] ]
+                [ FORCE NOT NULL <replaceable class="parameter">column</replaceable> [, ...] ] ] ]
 
 COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable class="parameter">column</replaceable> [, ...] ) ] | ( <replaceable class="parameter">query</replaceable> ) }
     TO { '<replaceable class="parameter">filename</replaceable>' | STDOUT }
@@ -874,7 +874,7 @@ COPY { <replaceable class="parameter">table_name</replaceable> [ ( <replaceable
           [ CSV [ HEADER ]
                 [ QUOTE [ AS ] '<replaceable class="parameter">quote</replaceable>' ]
                 [ ESCAPE [ AS ] '<replaceable class="parameter">escape</replaceable>' ]
-                [ FORCE QUOTE { <replaceable class="parameter">column</replaceable> [, ...] | * } ]
+                [ FORCE QUOTE { <replaceable class="parameter">column</replaceable> [, ...] | * } ] ] ]
 </synopsis>
 
    Note that in this syntax, <literal>BINARY</> and <literal>CSV</> are