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	relnotes: improve PG 15 schema permission change wording
Reported-by: Noah Misch Discussion: https://postgr.es/m/20220630050808.GC2257984@rfd.leadboat.com Backpatch-through: 15 only
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		@@ -58,16 +58,20 @@ Author: Noah Misch <noah@leadboat.com>
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     </para>
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     <para>
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      This is a change in the default for newly-created databases in
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      existing clusters and for new clusters;  <literal>USAGE</literal>
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      permissions on the <literal>public</literal> schema has not
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      been changed.  Databases restored from previous Postgres releases
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      will be restored with their current permissions.  Users wishing
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      to have the former permissions will need to grant
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      <literal>CREATE</literal> permission for <literal>PUBLIC</literal>
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      on the <literal>public</literal> schema; this change can be made
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      on <literal>template1</literal> to cause all new databases
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      to have these permissions.
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      The new default is one of the secure schema usage patterns that <xref
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      linkend="ddl-schemas-patterns"/> has recommended since the security
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      release for CVE-2018-1058.  The change applies to newly-created
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      databases in existing clusters and for new clusters.  Upgrading a
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      cluster or restoring a database dump will preserve existing permissions.
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     </para>
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     <para>
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      For existing databases, especially those having multiple users,
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      consider revoking <literal>CREATE</literal> permission on
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      the <literal>public</literal> schema to adopt this new default.
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      For new databases having zero need to defend against insider threats,
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      granting <literal>CREATE</literal> permission will yield the behavior
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      of prior releases.
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     </para>
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    </listitem>
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