pgsql: Re-add FAQ item: <H3 id="item4.19">4.19) Why do I get

Log Message:
-----------
Re-add FAQ item:

<H3 id="item4.19">4.19) Why do I get "relation with OID #####
does not exist" errors when accessing temporary tables in PL/PgSQL
functions?</H3>

Modified Files:
--------------
pgsql/doc:
FAQ (r1.439 -> r1.440)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/FAQ?r1=1.439&amp;r2=1.440)
pgsql/doc/src/FAQ:
FAQ.html (r1.395 -> r1.396)
(http://developer.postgresql.org/cvsweb.cgi/pgsql/doc/src/FAQ/FAQ.html?r1=1.395&amp;r2=1.396)