Improve description of read/write traffic scalability

Greg Smith, after a suggestion of James Bruce

Branch
------
master

Details
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http://git.postgresql.org/pg/commitdiff/561485709673f4bc05240e891dd9056bdedbbcbc

Modified Files
--------------
doc/src/sgml/high-availability.sgml |    7 ++++---
1 files changed, 4 insertions(+), 3 deletions(-)

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