pgsql: Add: > > o Properly mark all libpq-exported functions with

Log Message:
-----------
Add:

>
>     o Properly mark all libpq-exported functions with "PQ"
>
>       http://archives.postgresql.org/pgsql-hackers/2005-10/msg00696.php

Modified Files:
--------------
    pgsql/doc:
        TODO (r1.1869 -> r1.1870)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1869&r2=1.1870)
    pgsql/doc/src/FAQ:
        TODO.html (r1.372 -> r1.373)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.372&r2=1.373)