btree.sgml typo?

There is a sentence in btree.sgml:

  <productname>PostgreSQL</productname> includes an implementation of the
  standard <acronym>btree</acronym> (multi-way binary tree) index data
  structure.

I think the term "btree" here means "multi-way balanced tree", rather
than "multi-way binary tree". In fact in our btree, there could be
more than one key in a node. Patch attached.

Best regards,
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese:http://www.sraoss.co.jp