Update descriptions of disabled output handler

reference/outcontrol/constants.xml

@@ -185,8 +185,8 @@
     <para>
      Indicates that the output handler is disabled.
      This flag is set when the output handler returns &false;
-     or fails while processing the buffer,
-     or it was set prior to calling the output handler.
+     or fails while processing the buffer.
+     Prior to PHP 8.4.0, this flag can be set when starting an output buffer.
     </para>
    </listitem>
   </varlistentry>

reference/outcontrol/user-level-output-buffers.xml

@@ -392,9 +392,11 @@
     If the <constant>PHP_OUTPUT_HANDLER_DISABLED</constant> of a handler is set,
     the handler will not be invoked by calling
     <function>ob_end_clean</function>, <function>ob_end_flush</function>,
-    <function>ob_get_clean</function>, <function>ob_get_flush</function>
+    <function>ob_get_clean</function>, <function>ob_get_flush</function>,
+    <function>ob_clean</function>,
+    <function>ob_flush</function>
     or during PHP's shutdown process.
-    This flag has no effect on when calling <function>ob_clean</function>
+    Prior to PHP 8.4.0, this flag has no effect when calling <function>ob_clean</function>
     or <function>ob_flush</function>.
    </simpara>
   </note>
@@ -599,9 +601,11 @@
     If the <constant>PHP_OUTPUT_HANDLER_DISABLED</constant> of a handler is set,
     the handler will not be invoked by calling
     <function>ob_end_clean</function>, <function>ob_end_flush</function>,
-    <function>ob_get_clean</function>, <function>ob_get_flush</function>
+    <function>ob_get_clean</function>, <function>ob_get_flush</function>,
+    <function>ob_clean</function>,
+    <function>ob_flush</function>
     or during PHP's shutdown process.
-    This flag has no effect on when calling <function>ob_clean</function>
+    Prior to PHP 8.4.0, this flag has no effect when calling <function>ob_clean</function>
     or <function>ob_flush</function>.
    </simpara>
   </note>