pgsql: Add description for variable-length header: > One idea is to

Log Message:
-----------
Add description for variable-length header:

>       One idea is to store the header in network byte order (high bits
>       first), and read the high bits to determine the header length.

Modified Files:
--------------
    pgsql/doc:
        TODO (r1.1976 -> r1.1977)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.1976&r2=1.1977)
    pgsql/doc/src/FAQ:
        TODO.html (r1.478 -> r1.479)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.478&r2=1.479)