Fix E_ALL constant value (#4724)

Author: sy-records

reference/errorfunc/constants.xml

@@ -328,8 +328,13 @@
      Bit-mask that contains every single error, warning, and notice.
     </simpara>
     <simpara>
-     Value of the constant: <literal>32767</literal>
+     Value of the constant: <literal>30719</literal>
     </simpara>
+    <warning>
+     <simpara>
+      Prior to PHP 8.4, the constant value was: <literal>32767</literal>
+     </simpara>
+    </warning>
    </listitem>
   </varlistentry>