pgsql: Improve recovery target settings documentation.

Improve recovery target settings documentation.

Commit 815d71dee hadn't bothered to update the documentation to match the
behavioral change, and a lot of other text in this section was badly in
need of copy-editing.

Branch
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REL9_4_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/5fc34ba880e1223268ffbbe8be8621342c883151

Modified Files
--------------
doc/src/sgml/recovery-config.sgml | 26 ++++++++++++++------------
1 file changed, 14 insertions(+), 12 deletions(-)

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