Added notes stating that these features were added in 8.4:

   lazy objects and property hooks
This closes #4375

Author: philip

language/oop5/lazy-objects.xml

@@ -26,6 +26,13 @@
   identities.
  </simpara>
 
+ <note>
+  <title>Version Information</title>
+  <simpara>
+   Lazy objects were introduced in PHP 8.4.
+  </simpara>
+ </note>
+
  <sect2 xml:id="language.oop5.lazy-objects.creation">
   <title>Creating Lazy Objects</title>
 

language/oop5/property-hooks.xml

@@ -43,6 +43,14 @@
   operation in addition to altering its behavior, use
   <link linkend="language.oop5.visibility-members-aviz">asymmetric property visibility</link>.
  </simpara>
+
+ <note>
+  <title>Version Information</title>
+  <simpara>
+   Property hooks were introduced in PHP 8.4.
+  </simpara>
+ </note>
+
  <sect2>
   <title>Basic Hook Syntax</title>
   <simpara>