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Small fix in MetricsQL.md (#6452)

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### Describe Your Changes

value→valid

### Checklist

The following checks are **mandatory**:

- [x] My change adheres [VictoriaMetrics contributing
guidelines](https://docs.victoriametrics.com/contributing/).

Signed-off-by: Lapo Luchini <lapo@lapo.it>
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docs/MetricsQL.md
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@ -107,7 +107,7 @@ The list of MetricsQL features on top of PromQL:
* Trailing commas on all the lists are allowed - label filters, function args and with expressions.
For instance, the following queries are valid: `m{foo="bar",}`, `f(a, b,)`, `WITH (x=y,) x`.
This simplifies maintenance of multi-line queries.
* Metric names and label names may contain any unicode letter. For example `температура{город="Київ"}` is a value MetricsQL expression.
* Metric names and label names may contain any unicode letter. For example `температура{город="Київ"}` is a valid MetricsQL expression.
* Metric names and labels names may contain escaped chars. For example, `foo\-bar{baz\=aa="b"}` is valid expression.
It returns time series with name `foo-bar` containing label `baz=aa` with value `b`.
Additionally, the following escape sequences are supported: