Mention of connection options

I have applied the following documentation patch to mention that
libpgtcl's connection options are listed in libpq's manual page.  I also
fixed some libpq++ markup.

Hope it is OK.

--
  Bruce Momjian                        |  http://candle.pha.pa.us
  pgman@candle.pha.pa.us               |  (610) 853-3000
  +  If your life is a hard drive,     |  830 Blythe Avenue
  +  Christ can be your backup.        |  Drexel Hill, Pennsylvania 19026
Index: doc/src/sgml/libpgtcl.sgml
===================================================================
RCS file: /home/projects/pgsql/cvsroot/pgsql/doc/src/sgml/libpgtcl.sgml,v
retrieving revision 1.13
diff -c -r1.13 libpgtcl.sgml
*** doc/src/sgml/libpgtcl.sgml    2000/09/29 20:21:34    1.13
--- doc/src/sgml/libpgtcl.sgml    2001/04/30 04:24:19
***************
*** 188,193 ****
--- 188,195 ----
  </TERM>
  <LISTITEM>
  <PARA>A string of connection options, each written in the form keyword = value.
+ A list of valid options can be found in <filename>libpq</>'s
+ <function>PQconnectdb()</> manual entry.
  </PARA>
  </LISTITEM>
  </VARLISTENTRY>
Index: doc/src/sgml/libpq++.sgml
===================================================================
RCS file: /home/projects/pgsql/cvsroot/pgsql/doc/src/sgml/libpq++.sgml,v
retrieving revision 1.24
diff -c -r1.24 libpq++.sgml
*** doc/src/sgml/libpq++.sgml    2001/01/20 20:59:28    1.24
--- doc/src/sgml/libpq++.sgml    2001/04/30 04:24:20
***************
*** 65,77 ****

      <para>
       The following environment variables can be used to select default
!      connection parameter values, which will be used by PQconnectdb or
!      PQsetdbLogin if no value is directly specified by the calling code.
       These are useful to avoid hard-coding database names into simple
       application programs.
       <note>
        <para>
!        <filename>libpq++</filename> uses only environment variables or PQconnectdb
         conninfo style strings.
        </para>
       </note>
--- 65,79 ----

      <para>
       The following environment variables can be used to select default
!      connection parameter values, which will be used by
!      <function>PQconnectdb</> or
!      <function>PQsetdbLogin</> if no value is directly specified by the calling code.
       These are useful to avoid hard-coding database names into simple
       application programs.
       <note>
        <para>
!        <filename>libpq++</filename> uses only environment variables or
!        <filename>libpq</>'s <function>PQconnectdb</>
         conninfo style strings.
        </para>
       </note>