Thread: pgsql: Adjust comment in .history file to match recovery target

Log Message:
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Adjust comment in .history file to match recovery target specified. Comment
present since 8.0 was never fully meaningful, since two recovery targets
cannot be specified. Refactor recovery target type to make this change
and associated code easier to understand. No change in function.

Bug report arising from internal support question.

Modified Files:
--------------
    pgsql/src/backend/access/transam:
        xlog.c (r1.382 -> r1.383)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/backend/access/transam/xlog.c?r1=1.382&r2=1.383)
    pgsql/src/include/access:
        xlog.h (r1.103 -> r1.104)
        (http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/src/include/access/xlog.h?r1=1.103&r2=1.104)