pgsql: TODO item not needed anymore now that the buffer cache is

Log Message:
-----------
TODO item not needed anymore now that the buffer cache is
scan-resistant:

<
< * Allow free-behind capability for large sequential scans, perhaps using
<   posix_fadvise()
<
<   Posix_fadvise() can control both sequential/random file caching and
<   free-behind behavior, but it is unclear how the setting affects other
<   backends that also have the file open, and the feature is not supported
<   on all operating systems.

Modified Files:
--------------
    pgsql/doc:
        TODO (r1.2197 -> r1.2198)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/TODO.diff?r1=1.2197&r2=1.2198)
    pgsql/doc/src/FAQ:
        TODO.html (r1.698 -> r1.699)
        (http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/TODO.html.diff?r1=1.698&r2=1.699)