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docs: remove outdated note about unique indexes
Patch by Josh Kupershmidt Backpatch through 9.5
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@ -655,11 +655,7 @@ CREATE UNIQUE INDEX <replaceable>name</replaceable> ON <replaceable>table</repla
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<note>
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<note>
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<para>
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<para>
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The preferred way to add a unique constraint to a table is
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There's no need to manually
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<literal>ALTER TABLE ... ADD CONSTRAINT</literal>. The use of
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indexes to enforce unique constraints could be considered an
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implementation detail that should not be accessed directly.
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One should, however, be aware that there's no need to manually
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create indexes on unique columns; doing so would just duplicate
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create indexes on unique columns; doing so would just duplicate
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the automatically-created index.
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the automatically-created index.
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</para>
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</para>
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