docs: add bench test case TaskResult type description (#6704)

Author: btea

docs/api/index.md

@@ -514,6 +514,119 @@ export interface Options {
   teardown?: Hook
 }
 ```
+After the test case is run, the output structure information is as follows:
+
+```
+  name                      hz     min     max    mean     p75     p99    p995    p999     rme  samples
+· normal sorting  6,526,368.12  0.0001  0.3638  0.0002  0.0002  0.0002  0.0002  0.0004  ±1.41%   652638
+```
+```ts
+export interface TaskResult {
+  /*
+   * the last error that was thrown while running the task
+   */
+  error?: unknown
+
+  /**
+   * The amount of time in milliseconds to run the benchmark task (cycle).
+   */
+  totalTime: number
+
+  /**
+   * the minimum value in the samples
+   */
+  min: number
+  /**
+   * the maximum value in the samples
+   */
+  max: number
+
+  /**
+   * the number of operations per second
+   */
+  hz: number
+
+  /**
+   * how long each operation takes (ms)
+   */
+  period: number
+
+  /**
+   * task samples of each task iteration time (ms)
+   */
+  samples: number[]
+
+  /**
+   * samples mean/average (estimate of the population mean)
+   */
+  mean: number
+
+  /**
+   * samples variance (estimate of the population variance)
+   */
+  variance: number
+
+  /**
+   * samples standard deviation (estimate of the population standard deviation)
+   */
+  sd: number
+
+  /**
+   * standard error of the mean (a.k.a. the standard deviation of the sampling distribution of the sample mean)
+   */
+  sem: number
+
+  /**
+   * degrees of freedom
+   */
+  df: number
+
+  /**
+   * critical value of the samples
+   */
+  critical: number
+
+  /**
+   * margin of error
+   */
+  moe: number
+
+  /**
+   * relative margin of error
+   */
+  rme: number
+
+  /**
+   * median absolute deviation
+   */
+  mad: number
+
+  /**
+   * p50/median percentile
+   */
+  p50: number
+
+  /**
+   * p75 percentile
+   */
+  p75: number
+
+  /**
+   * p99 percentile
+   */
+  p99: number
+
+  /**
+   * p995 percentile
+   */
+  p995: number
+
+  /**
+   * p999 percentile
+   */
+  p999: number
+}
+```
 
 ### bench.skip