Fix omissions in documentation of the pg_roles view.

Somehow, column rolconfig got removed from the documentation of the
pg_roles view in the 9.0 cycle, although the column is actually still
there.  In 9.1, we'd also forgotten to document the rolreplication column.
Spotted by Sakamoto Masahiko.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/4fa046a39ebdaf4c9191ffff8a57b0759c52f3f3

Modified Files
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doc/src/sgml/catalogs.sgml |   25 ++++++++++++++++++++++---
1 files changed, 22 insertions(+), 3 deletions(-)

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