address a comment

Co-authored-by: Gina Peter Banyard <[email protected]>

Author: SakiTakamachi

reference/bc/bcmath.number.xml

@@ -80,9 +80,9 @@
     <varlistentry xml:id="bcmath-number.props.scale">
      <term><varname>scale</varname></term>
      <listitem>
-      <para>
+      <simpara>
        The scale value currently set on the object.
-      </para>
+      </simpara>
      </listitem>
     </varlistentry>
    </variablelist>