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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master

Details
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http://git.postgresql.org/pg/commitdiff/e311cd6ded096122a5f2b5cbe91bc3a9f0dda3cb

Modified Files
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doc/src/sgml/recovery-config.sgml | 94 +++++++++++++++++++------------------
1 file changed, 49 insertions(+), 45 deletions(-)

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