[SPARK-47439][PYTHON] Document Python Data Source API in API reference page #45561
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What changes were proposed in this pull request?
This PR proposes to document Python Data Source API in Python API reference page.
Why are the changes needed?
For users/developers to know how to use them.
Does this PR introduce any user-facing change?
Yes, it documents Python Data Source API.
How was this patch tested?
Manually checked the output from Python API reference build
cd python/docs make clean html open build/html/index.html
Was this patch authored or co-authored using generative AI tooling?
No.