pgsql: Fix ancient docs/comments thinko: XID comparison is mod 2^32, no

Fix ancient docs/comments thinko: XID comparison is mod 2^32, not 2^31.

Pointed out by Gianni Ciolli.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/607f889c71dd202008173a23115cc51dcad1c73d

Modified Files
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doc/src/sgml/maintenance.sgml | 2 +-
src/backend/access/transam/transam.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)

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