Fix flatten filter documentation
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@ -127,7 +127,7 @@ Flatten a list (same thing the `flatten` lookup does)::
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Flatten only the first level of a list (akin to the `items` lookup)::
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{{ [3, [4, [2]] ]|flatten(level=1) }}
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{{ [3, [4, [2]] ]|flatten(levels=1) }}
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.. _set_theory_filters:
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