Generalize width_bucket() documentation because b1/b2 can be

interchanged.

doc/src/sgml/func.sgml

-<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.331 2006/08/21 00:57:23 tgl Exp $ -->
+<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.332 2006/08/22 00:49:19 momjian Exp $ -->
 
  <chapter id="functions">
   <title>Functions and Operators</title>
@@ -837,8 +837,7 @@
        <entry><type>int</type></entry>
        <entry>return the bucket to which <parameter>operand</> would
        be assigned in an equidepth histogram with <parameter>count</>
-       buckets, an upper bound of <parameter>b1</>, and a lower bound
-       of <parameter>b2</></entry>
+       buckets, in the range <parameter>b1</> to <parameter>b2</></entry>
        <entry><literal>width_bucket(5.35, 0.024, 10.06, 5)</literal></entry>
        <entry><literal>3</literal></entry>
       </row>