docs: fix typo in is_null expression explainer (#55988)

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Mike McFarland 2022-09-29 16:04:43 +01:00 committed by GitHub
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@ -114,7 +114,7 @@ is_nan takes a number or a series and returns `1` for `NaN` values and `0` for o
##### is_null
is_nan takes a number or a series and returns `1` for `null` values and `0` for other values. For example `is_null($A)`.
is_null takes a number or a series and returns `1` for `null` values and `0` for other values. For example `is_null($A)`.
##### is_number