doc:  improve description of synchronous_commit modes

Previously it wasn't clear exactly what each of the synchronous_commit
modes accomplished.  This clarifies that, and adds a table describing it.
Only backpatched through 9.6 since 9.5 doesn't have all the options.

Reported-by: [email protected]

Discussion: 
https://postgr.es/m/[email protected]

Backpatch-through: 9.6

Branch
------
REL_11_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/3c4b5206850263ec0585db60bf5d17187b0dd513

Modified Files
--------------
doc/src/sgml/config.sgml  | 144 ++++++++++++++++++++++++++++++++++++----------
src/include/access/xact.h |   3 +-
2 files changed, 116 insertions(+), 31 deletions(-)

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