pgsql: doc: update effective_io_concurrency for SSDs

doc: update effective_io_concurrency for SSDs

SSDs are no longer exotic, so recommend a default in the hundreds for
them.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/46eafc8855d7c21e2c1a45faa77a3d5a2fc2c8b2

Modified Files
--------------
doc/src/sgml/config.sgml | 12 ++++--------
1 file changed, 4 insertions(+), 8 deletions(-)

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