modules/pam_limits/limits.conf.5.xml: Document the limits.d existence.
<refsect1 id='limits.conf-description'>
<title>DESCRIPTION</title>
+ <para>
+ The <emphasis>pam_limits.so</emphasis> module applies ulimit limits,
+ nice priority and number of simultaneous login sessions limit to user
+ login sessions. This description of the configuration file syntax
+ applies to the <filename>/etc/security/limits.conf</filename> file and
+ <filename>*.conf</filename> files in the
+ <filename>/etc/security/limits.d</filename> directory.
+ </para>
<para>
The syntax of the lines is as follows:
</para>