doc: Tweak "cube" index entry

With the arrival of the CUBE key word/feature, the index entries for the
cube extension and the CUBE feature were collapsed into one.  Tweak the
entry for the cube extension so they are separate entries.

diff --git a/doc/src/sgml/cube.sgml b/doc/src/sgml/cube.sgml
index 60bd84bf22ba853e574f9e32fe0192c12d535eaf..0a226ca54289b6d574ab1b6a3083a8ff4e135a7d 100644 (file)
--- a/doc/src/sgml/cube.sgml
+++ b/doc/src/sgml/cube.sgml
@@ -4,7 +4,7 @@
  <title>cube</title>
 
  <indexterm zone="cube">
-  <primary>cube</primary>
+  <primary>cube (extension)</primary>
  </indexterm>
 
  <para>