pgsql: doc: improve configuration management section

doc: improve configuration management section

Patch by David Johnston

Backpatch through 9.4

Branch
------
REL9_4_STABLE

Details
-------
http://git.postgresql.org/pg/commitdiff/1e6ba64080d0906e428cc3f58e612f8c237fc755

Modified Files
--------------
doc/src/sgml/config.sgml | 368 ++++++++++++++++++++++++++++++----------------
1 file changed, 241 insertions(+), 127 deletions(-)

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