[Docs] update data types doc and fix some typo

[Astralidea]

Proposed changes

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Fix #4633
Fix #4634
Fix #4635

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• [] New feature (non-breaking change which adds functionality)
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• [] Code refactor (Modify the code structure, format the code, etc...)

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[morningman]

为什么bitmap在实时场景下不能做到精确去重呢？

[Astralidea]

实时场景下的BITMAP，通常不会引入全局字典，因为当全局字典大了之后时延很大，实时的吞吐和时延都会明显下降。导致查询和更新全局字典的成本和时延很高，会极大降低实时导入的性能。
这块文档需要特别说明一下吗？

[morningman]

哦，这个描述不太准确。bitmap这个类型本身是精确的。只是在“实时场景”下，用户导入的数据本身是不精确的。比如不使用全局字典，或者使用了 bitmap_hash() 等函数导致的误差，这些和bitmap本身的实现无关。这个需要说明下。

[Astralidea]

这个仓库又让我搞没了，换到另一个 #4712 吧，我改了一下描述，看看还有啥问题。