pgsql: Fix some obsolete information in src/backend/optimizer/README.

Fix some obsolete information in src/backend/optimizer/README.

Constant quals aren't handled the same way they used to be. Also,
add mention of a couple more major steps in grouping_planner.
Per complaint a couple months back from Etsuro Fujita.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/6331de1d44f01d408aa48c5c996bae8932f7a072

Modified Files
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src/backend/optimizer/README | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)

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