Log Message:
-----------
Document in postgresql.conf that the max_standby_delay default is 30
'seconds'.
Modified Files:
--------------
pgsql/src/backend/utils/misc:
postgresql.conf.sample (r1.279 -> r1.280)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/utils/misc/postgresql.conf.sample?r1=1.279&r2=1.280)