Resolve comment

Signed-off-by: Yang Zhang <[email protected]>

Author: v01dstar

tikv-configuration-file.md

@@ -330,6 +330,7 @@ Configuration items related to the single thread pool serving read requests. Thi
       - A scale-up is prevented if it would cause CPU usage to exceed the threshold minus a 10% leeway.
 
   For example, setting this parameter to `0.8` ensures that the unified read pool does not consume more than 80% of the available CPU resources.
++ This feature is active only when [`readpool.unified.auto-adjust-pool-size`](#auto-adjust-pool-size-new-in-v630) is set to `true`.
 + Default value: `0.0`
 + Value range: `[0.0, 1.0]`