pgsql: Explain CHECK constraint handling in postgres_fdw's IMPORT FOREI

Explain CHECK constraint handling in postgres_fdw's IMPORT FOREIGN SCHEMA.

The existing documentation could easily be misinterpreted, and it failed to
explain the inconsistent-evaluation hazard that deterred us from supporting
automatic importing of check constraints. Revise it.

Etsuro Fujita, further expanded by me

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e70ec8230a2c0e7363bb7abf4d55dddbdec89fe1

Modified Files
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doc/src/sgml/postgres-fdw.sgml | 17 ++++++++++++-----
1 file changed, 12 insertions(+), 5 deletions(-)

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