PHP 8.1 | MigrationGuide/New constants: add missing constants [3]

> Added `POSIX_RLIMIT_KQUEUES` and `POSIX_RLIMIT_NPTS`. These rlimits are only available on FreeBSD.

Refs:
* https://www.php.net/manual/en/migration81.new-features.php#migration81.new-features.posix
* php/php-src#6608
* php/php-src@ebca8de

Author: jrfnl

appendices/migration81/constants.xml

@@ -63,6 +63,19 @@
   </itemizedlist>
  </sect2>
 
+ <sect2 xml:id="migration81.constants.posix">
+  <title>POSIX</title>
+
+  <itemizedlist>
+   <listitem>
+    <simpara><constant>POSIX_RLIMIT_KQUEUES</constant></simpara>
+   </listitem>
+   <listitem>
+    <simpara><constant>POSIX_RLIMIT_NPTS</constant></simpara>
+   </listitem>
+  </itemizedlist>
+ </sect2>
+
  <sect2 xml:id="migration81.constants.sockets">
   <title>Sockets</title>