[FEATURE]: The documentation of Pymilvus' API reference needs to be improved.

[JackLCL]

Is there an existing issue for this?

• [X] I have searched the existing issues

Is your feature request related to a problem? Please describe.

At present, the API reference document of Pymilvus is not very complete, and there are many interfaces that are already supported in Pymilvus, but they do not appear in the API reference.

link: https://milvus.io/api-reference/pymilvus/v2.0.2/About.md

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Anything else?

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