pgsql: C comment: mention why the Gregorian calendar is used pre-1582

C comment: mention why the Gregorian calendar is used pre-1582

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/171c377a0abe12d1418540dc154feccd9355995e

Modified Files
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src/include/utils/datetime.h | 5 +++++
1 file changed, 5 insertions(+)

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