pgsql: Improvements to the replication protocol documentation.

Improvements to the replication protocol documentation.

Document the CREATE_REPLICATION_SLOT's output_plugin parameter; that
START_REPLICATION ... LOGICAL takes parameters; that START_REPLICATION
... LOGICAL uses the same messages as ... PHYSICAL; and be more
consistent with the usage of <literal/>.

Michael Paquier, with some additional changes by me.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/a57509821c3147b2bf57560e3bce1641d78a7519

Modified Files
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doc/src/sgml/protocol.sgml | 44 +++++++++++++++++++++++++++++++++++++++-----
1 file changed, 39 insertions(+), 5 deletions(-)

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