pgsql: Do some copy-editing on the docs for replication origins.

Do some copy-editing on the docs for replication origins.

Minor grammar and markup improvements.

Branch
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REL9_5_STABLE

Details
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http://git.postgresql.org/pg/commitdiff/2e5c9284f688d124b0169ff5b86003ca86842666

Modified Files
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doc/src/sgml/func.sgml | 39 ++++++++++++++-------------
doc/src/sgml/replication-origins.sgml | 47 ++++++++++++++++++---------------
2 files changed, 46 insertions(+), 40 deletions(-)

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