Add link to posix.constants.setrlimit page

Author: zonuexe

reference/posix/functions/posix-getrlimit.xml

@@ -26,10 +26,10 @@
     <varlistentry>
      <term><parameter>resource</parameter></term>
      <listitem>
-      <para>
-       If &null; all resource limits will be fetched.
-       Otherwise, the only limits of the resource type provided will be returned.
-      </para>
+      The
+      <link linkend="posix.constants.setrlimit">resource limit constant</link>
+      identifying the specific limit to retrieve.
+      If &null;, all current resource limits will be returned.
      </listitem>
     </varlistentry>
    </variablelist>