Update metric.md (#1824)

* Update metric.md

* Update metric.md

* Update metric.md

* Update metric.md

* Update metric.md

Co-authored-by: 谷溪 <guxi99@gmail.com>
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@ -427,3 +427,4 @@ foreach ($metric['samples'] as $key => $value) {
];
}
```
- 如果选择 **自定义 Histogram Bucket**, 一定要注意注册的时机, 请确保 `registerHistogram()` 之前未触发过同一名称的 Histogram。