pgsql: Restructure doc sections about statistics views

Restructure doc sections about statistics views

Break out the "dynamic statistics" views in the table from the
"collected statistics" ones. Could do with some more refactoring,
but this is a start.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/386c9b73839bd4cae489451122801c31496d20e8

Modified Files
--------------
doc/src/sgml/monitoring.sgml | 440 ++++++++++++++++++++++--------------------
1 file changed, 231 insertions(+), 209 deletions(-)

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