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docs: adjust simpler language for NULL return from ANY/ALL
Adjustment to commit 8610c973dd
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Reported-by: Tom Lane
Discussion: https://postgr.es/m/17406.1541168421@sss.pgh.pa.us
Backpatch-through: 9.3
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@ -15193,7 +15193,7 @@ WHERE EXISTS (SELECT 1 FROM tab2 WHERE col2 = tab1.col2);
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subquery row (including the case where the subquery returns no
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rows).
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The result is NULL if no comparison with a subquery row returns true,
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and it returns NULL for at least one row.
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and at least one comparison returns NULL.
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</para>
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<para>
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@ -15219,7 +15219,7 @@ WHERE EXISTS (SELECT 1 FROM tab2 WHERE col2 = tab1.col2);
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(including the case where the subquery returns no rows).
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The result is <quote>false</quote> if any false result is found.
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The result is NULL if no comparison with a subquery row returns false,
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and it returns NULL for at least one row.
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and at least one comparison returns NULL.
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</para>
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<para>
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@ -15249,7 +15249,7 @@ WHERE EXISTS (SELECT 1 FROM tab2 WHERE col2 = tab1.col2);
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The result is <quote>false</quote> if the comparison returns false for any
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subquery row.
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The result is NULL if no comparison with a subquery row returns false,
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and it returns NULL for at least one row.
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and at least one comparison returns NULL.
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</para>
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<para>
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