Fix units in HistogramBuilder docs example

prometools TimeHistograms use seconds as their base unit, so the
comment on the HistogramBuilder example is wrong.
48f6a99 fixed this in another example,
but this one was missed back then.

Author: TheJokr

foundations/src/telemetry/metrics/mod.rs

@@ -346,8 +346,8 @@ where
 /// #[metrics]
 /// pub mod my_app_metrics {
 ///     #[ctor = HistogramBuilder {
-///         // 0 us to 10 ms
-///         buckets: &[0.0, 1E-4, 2E-4, 3E-4, 4E-4, 5E-4, 6E-4, 7E-4, 8E-4, 9E-4, 1E-3, 1E-2, 2E-2, 4E-2, 8E-2, 1E-1, 1.0],
+///         // 100 us to 1 second
+///         buckets: &[1E-4, 2E-4, 3E-4, 4E-4, 5E-4, 6E-4, 7E-4, 8E-4, 9E-4, 1E-3, 1E-2, 2E-2, 4E-2, 8E-2, 1E-1, 1.0],
 ///     }]
 ///     pub fn tokio_runtime_task_schedule_delay_histogram(
 ///         task: String,