Cannot set mail.force_extra_parameters as PHP_INI_PERDIR (#1081)

However, it can be set in `httpd.conf`.

---------

Co-authored-by: Christoph M. Becker <cmbecker69@gmx.de>

Author: marcovtwout

appendices/ini.list.xml

@@ -452,7 +452,7 @@
       <row>
        <entry>mail.force_extra_parameters</entry>
        <entry>&null;</entry>
-       <entry>&php.ini; only</entry>
+       <entry><constant>INI_SYSTEM</constant></entry>
        <entry></entry>
       </row>
       <row>

reference/mail/ini.xml

@@ -31,7 +31,7 @@
     <row>
      <entry><link linkend="ini.mail.force_extra_parameters">mail.force_extra_parameters</link></entry>
      <entry>NULL</entry>
-     <entry><constant>INI_SYSTEM</constant>|<constant>INI_PERDIR</constant></entry>
+     <entry><constant>INI_SYSTEM</constant></entry>
      <entry></entry>
     </row>
     <row>
@@ -106,6 +106,11 @@
      parameters to the sendmail binary. These parameters will always replace
      the value of the 5th parameter to <function>mail</function>.
     </para>
+    <simpara>
+     In addition to the default behavior for <constant>INI_SYSTEM</constant>,
+     this value can also be set with <literal>php_value</literal>
+     in <filename>httpd.conf</filename> (but this is not recommended).
+    </simpara>
    </listitem>
   </varlistentry>