Improve wording of documentation on default privileges.

Per recent -hackers discussion.

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/75726307e6164673c48d6ce1d143a075b8ce18fa

Modified Files
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doc/src/sgml/ref/grant.sgml |   19 ++++++++++---------
1 files changed, 10 insertions(+), 9 deletions(-)

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