Update TeX overflow documentation page pattern mask, in docs.

doc/src/sgml/docguide.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/docguide.sgml,v 1.82 2010/05/31 22:14:20 momjian Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/docguide.sgml,v 1.83 2010/05/31 22:15:25 momjian Exp $ -->
 
 <appendix id="docguide">
  <title>Documentation</title>
@@ -659,7 +659,7 @@ save_size.pdfjadetex = 15000
     points too wide will probably not fit on the printed page (assuming
     one inch margins).  To find the <acronym>SGML</acronym> text
     causing the overflow, find the first page number mentioned above
-    the overflow message, e.g.  <literal>[50 XXX]</> (page 50), and look
+    the overflow message, e.g.  <literal>[50 ###]</> (page 50), and look
     at that page in the <acronym>PDF</acronym> file to see the overflow
     text and adjust the <acronym>SGML</acronym> accordingly.
    </para>