pgsql: doc: reorder logical replication benefits in a logical order

doc: reorder logical replication benefits in a logical order

The previous ordering was hard to understand and remember. Also adjust
wording to be more consistent with surrounding items.

Backpatch-through: master

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/acbc9beaaed6ee88416e1dcef5df77fd5baba0be

Modified Files
--------------
doc/src/sgml/logical-replication.sgml | 15 ++++++++-------
1 file changed, 8 insertions(+), 7 deletions(-)