fix(Update hash_collision.md):开放寻址只有一个桶不像链式地址有多个桶

[lingxier]

表述不应该提到多个桶，建议表述成桶中冲突的位置以及冲突之后的位置。即
最后两位相同的 key 都会被映射到桶中相同位置并产生冲突。而通过线性探测，它们被依次存储在该桶内原冲突位置及其之后的位置中。

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