doc(metric): fix incorrect explanation of how metric.WithAttributes works
#14396
| Job | Run time |
|---|---|
| 2m 14s | |
| 4m 11s | |
| 1m 0s | |
| 28s | |
| 1m 2s | |
| 2m 18s | |
| 1m 14s | |
| 1m 59s | |
| 48s | |
| 1m 40s | |
| 2m 48s | |
| 2m 4s | |
| 13s | |
| 1m 3s | |
| 2m 24s | |
| 27s | |
| 2m 32s | |
| 3m 27s | |
| 1m 59s | |
| 10s | |
| 1s | |
| 34m 2s |