Improve documentation of publication privilege checks

[Shlok Kyal]

Hi Hackers,

While reviewing the Security section of the logical replication
documentation, I felt that the description of privilege requirements
for publications is ambiguous, and clarity could be improved by
explicitly mentioning the associated SQL syntax. Thoughts?

Thanks,
Shlok Kyal

v1-0001-Improve-documentation-of-publication-privilege-ch.patch
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