Array type: Add a top of page link to the array functions docs (#4654)

language/types/array.xml

@@ -3,6 +3,10 @@
 <sect1 xml:id="language.types.array">
  <title>Arrays</title>
 
+ <para>
+  For a list of all array functions, see the <link linkend="ref.array">array functions</link> chapter in the documentation.
+ </para>
+
  <para>
   An <type>array</type> in PHP is actually an ordered map. A map is a type that
   associates <emphasis>values</emphasis> to <emphasis>keys</emphasis>. This type