Api docs: fix link to time durations
@@ -55,7 +55,7 @@ timestamps are always represented as Unix timestamps in seconds.
* `<series_selector>`: Prometheus [time series
selectors](basics.md#time-series-selectors) like `http_requests_total` or
`http_requests_total{method=~"(GET|POST)"}` and need to be URL-encoded.
-* `<duration>`: [Prometheus duration strings](basics.md#time_durations).
+* `<duration>`: [Prometheus duration strings](basics.md#time-durations).
For example, `5m` refers to a duration of 5 minutes.
* `<bool>`: boolean values (strings `true` and `false`).
