Remove GIST concurrency limitations section.

Christopher Kings-Lynne

doc/src/sgml/gist.sgml

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 <chapter id="GiST">
@@ -180,25 +180,6 @@ $PostgreSQL: pgsql/doc/src/sgml/gist.sgml,v 1.20 2005/06/29 01:23:49 momjian Exp
 
 </sect1>
 
-<sect1 id="limitations">
- <title>Limitations</title>
-
- <para>
-  The current implementation of <acronym>GiST</acronym> within
-  <productname>PostgreSQL</productname> has some major limitations:
-  <acronym>GiST</acronym> index access is not concurrent, and the
-  <acronym>GiST</acronym> interface doesn't allow the development of certain
-  data types, such as digital trees (see papers by Aoki et al).
- </para>
-
- <para>
-  Solutions to the concurrency problems appear in Marcel Kornacker's
-  thesis; however these ideas have not yet been put into practice in the
-  <productname>PostgreSQL</productname> implementation.
- </para>
-
-</sect1>
-
 <sect1 id="examples">
  <title>Examples</title>