doc issue missing type name "multirange" in chapter title

[Pavel Stehule]

Hi

I searched operators for multirange type, and the current doc is little bit
messy, because chapter "Range Functions and Operators" contains operators
and functions for multirange type too.

I think so this chapter should be renamed to Range, Multirange Functions
and Operators"

diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 0b5571460d..f6ed1568af 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -18164,7 +18164,7 @@ SELECT NULLIF(value, '(none)') ...
   </sect1>

  <sect1 id="functions-range">
-  <title>Range Functions and Operators</title>
+  <title>Range, Multirange Functions and Operators</title>

   <para>
    See <xref linkend="rangetypes"/> for an overview of range types.

Regards

Pavel