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(-)