typo on libpq.sgml

Hi,

I noticed a typo in libpq.sgml. In the folowing partagrasoh, 'TCP_KEEPINTVL'
should be 'TCP_KEEPCNT'. (In libpq's setKeepalivesCount(), '#ifdef TCP_KEEPCNT' is used.)

<varlistentry id="libpq-keepalives-count" xreflabel="keepalives_count">
<term><literal>keepalives_count</literal></term>
<listitem>
<para>
Controls the number of TCP keepalives that can be lost before the
client's connection to the server is considered dead. A value of
zero uses the system default. This parameter is ignored for
connections made via a Unix-domain socket, or if keepalives are disabled.
It is only supported on systems where the <symbol>TCP_KEEPINTVL</>
socket option is available; on other systems, it has no effect.
</para>
</listitem>
</varlistentry>

regards,
--
Shigehiro Honda