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Document "<bool>" placeholder in API (#4465)

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Signed-off-by: Julius Volz <julius.volz@gmail.com>
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@ -52,6 +52,8 @@ selectors](basics.md#time-series-selectors) like `http_requests_total` or
`<duration>` placeholders refer to Prometheus duration strings of the form
`[0-9]+[smhdwy]`. For example, `5m` refers to a duration of 5 minutes.
`<bool>` placeholders refer to boolean values (strings `true` and `false`).
## Expression queries
Query language expressions may be evaluated at a single instant or over a range