Add missing part of replication role docs

Noted by Peter E.

Branch
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master

Details
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http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=1996b482859c67726e77b80a263d3cce954e022d

Modified Files
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doc/src/sgml/user-manag.sgml |   17 ++++++++++++++++-
1 files changed, 16 insertions(+), 1 deletions(-)

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