psql environment doc addition

I was looking the other day for a variable that turned out to be
PGSSLMODE, but the psql docs didn't reveal it to me. I propose to add
the following para to the psql docs to point to additional info on
environment variables. I know it's in the SEE ALSO section, but that
didn't jump out at me, especially on the man page that just says:

SEE ALSO
Environment Variables (the documentation)

Any objections?

cheers

andrew

Index: psql-ref.sgml
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RCS file: /cvsroot/pgsql/doc/src/sgml/ref/psql-ref.sgml,v
retrieving revision 1.172
diff -c -r1.172 psql-ref.sgml
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<refsect1>
<title>Environment</title>

+ <para>
+ As a <application>libpq</application> application,
<application>psql</application>
+ is influenced by all the environment variables that influence the
+ <application>libpq</application> library. For a complete list of
those
+ variables, see <xref linkend="libpq-envars">.
+ </para>
+
<variablelist>
<varlistentry>
<term><envar>PAGER</envar></term>