docs/MetricsQL.md: typo fix after bdb743c88d

Updates https://github.com/VictoriaMetrics/VictoriaMetrics/issues/5071
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Aliaksandr Valialkin 2023-10-16 21:09:33 +02:00
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@ -1057,7 +1057,7 @@ This function is supported by PromQL. See also [rad](#rad).
#### drop_empty_series
`drop_empty_series(q) is a [transform function](#transform-functions), which drops empty series from `q`.
`drop_empty_series(q)` is a [transform function](#transform-functions), which drops empty series from `q`.
This function can be used when `default` operator should be applied only to non-empty series. For example,
`drop_empty_series(temperature < 30) default 42` returns series, which have at least a single sample smaller than 30 on the selected time range,