Fix doc bug #51959 (Update 5.3 migration guide with func_get_arg() BC break).

git-svn-id: https://svn.php.net/repository/phpdoc/en/trunk@300022 c90b9560-bf6c-de11-be94-00142212c4b1

appendices/migration53.xml

@@ -144,6 +144,15 @@
      magic method is now invoked on access to private and protected methods.
     </simpara>
    </listitem>
+   <listitem>
+    <simpara>
+     <function>func_get_arg</function>, <function>func_get_args</function> and
+     <function>func_num_args</function> can no longer be called from the
+     outermost scope of a file that has been included by calling
+     <function>include</function> or <function>require</function> from within
+     a function in the calling file.
+    </simpara>
+   </listitem>
   </itemizedlist>
   <simpara>
    The following keywords are now reserved and may not be used in function,