Fix links in “Serialization” section of property-hooks.xml (#4119)

Author: TimWolla

language/oop5/property-hooks.xml

@@ -500,16 +500,16 @@ class CaseFoldingStrings extends Strings
    just like any other normal read/write action.
   </simpara>
   <simplelist>
-   <member><function>var_dump()</function>: Use raw value</member>
-   <member><function>serialize()</function>: Use raw value</member>
-   <member><function>unserialize()</function>: Use raw value</member>
-   <member><code>__serialize()</code>/<code>__unserialize()</code>: Custom logic, uses get/set hook</member>
+   <member><function>var_dump</function>: Use raw value</member>
+   <member><function>serialize</function>: Use raw value</member>
+   <member><function>unserialize</function>: Use raw value</member>
+   <member><link linkend="object.serialize">__serialize()</link>/<link linkend="object.unserialize">__unserialize()</link>: Custom logic, uses get/set hook</member>
    <member>Array casting: Use raw value</member>
-   <member><function>var_export()</function>: Use get hook</member>
-   <member><function>json_encode()</function>: Use get hook</member>
-   <member>JsonSerializable: Custom logic, uses get hook</member>
-   <member><function>get_object_vars()</function>: Use get hook</member>
-   <member><function>get_mangled_object_vars()</function>: Use raw value</member>
+   <member><function>var_export</function>: Use get hook</member>
+   <member><function>json_encode</function>: Use get hook</member>
+   <member><interfacename>JsonSerializable</interfacename>: Custom logic, uses get hook</member>
+   <member><function>get_object_vars</function>: Use get hook</member>
+   <member><function>get_mangled_object_vars</function>: Use raw value</member>
   </simplelist>
  </sect2>
 </sect1>