Correct mistaken claims about EXPLAIN ANALYZE's handling of triggers.

Time spent executing AFTER triggers is not included in the runtime of the
associated ModifyTable node; in my patch of yesterday I confused queuing of
these triggers with their actual execution.  Spotted by Marko Tiikkaja.

Branch
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REL9_0_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/a48fb0b59811e8b41e727b54b39bef28d6f253ea

Modified Files
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doc/src/sgml/perform.sgml |   11 +++++++----
1 files changed, 7 insertions(+), 4 deletions(-)

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