[DOCS] Document PUBLIC grants on PUBLIC schema

The following documentation comment has been logged on the website:

Page: https://www.postgresql.org/docs/9.6/static/sql-grant.html
Description:

The GRANT documentation, regarding the PUBLIC role, says:

> No privileges are granted to PUBLIC by default on tables, columns, schemas
or tablespaces.

But the PUBLIC role does receive USAGE and CREATE privileges on the PUBLIC
schema, correct? I think the documentation should point this out.

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