Change <para> to <simpara> and unwrap not from param description

Co-authored-by: Louis-Arnaud <la.catoire@gmail.com>

See #4958 (comment)

Co-authored-by: Louis-Arnaud <la.catoire@gmail.com>

Author: shaedrich

reference/array/functions/array-unique.xml

@@ -54,19 +54,17 @@
        Comparison type flags:
        <itemizedlist>
         <listitem>
-         <para>
-          <constant>SORT_REGULAR</constant> - compare items normally
-          (don't change types)
-          <note>
-           <simpara>
-            When combining <constant>SORT_REGULAR</constant> with arrays
-            mixing numeric and non-numeric strings, the sort-then-compare
-            algorithm may not place equal elements adjacent, which can
-            leave duplicates in the result. Use
-            <constant>SORT_STRING</constant> to avoid this.
-           </simpara>
-          </note>
-         </para>
+          <simpara><constant>SORT_REGULAR</constant> - compare items normally
+         (don't change types)</simpara>
+         <note>
+          <simpara>
+           When combining <constant>SORT_REGULAR</constant> with arrays
+           mixing numeric and non-numeric strings, the sort-then-compare
+           algorithm may not place equal elements adjacent, which can
+           leave duplicates in the result. Use
+           <constant>SORT_STRING</constant> to avoid this.
+          </simpara>
+         </note>
         </listitem>
         <listitem>
          <simpara><constant>SORT_NUMERIC</constant> - compare items numerically</simpara>