fix typo
close tikv/tikv#13706
fix-typo: replace `threahold` with `threshold `.
@@ -32,10 +32,10 @@ use crate::{
// the duration to check auto-scale unified-thread-pool's thread
const READ_POOL_THREAD_CHECK_DURATION: Duration = Duration::from_secs(10);
// consider scale out read pool size if the average thread cpu usage is higher
-// than this threahold.
+// than this threshold.
const READ_POOL_THREAD_HIGH_THRESHOLD: f64 = 0.8;
// consider scale in read pool size if the average thread cpu usage is lower
-// than this threahold.
+// than this threshold.
const READ_POOL_THREAD_LOW_THRESHOLD: f64 = 0.7;
// avg running tasks per-thread that indicates read-pool is busy
const RUNNING_TASKS_PER_THREAD_THRESHOLD: i64 = 3;
