[SPARK-39253][DOCS][PYTHON][FOLLOWUP] Add missing category for PySpark SQL reference. #36686
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What changes were proposed in this pull request?
This PR follows up #36647 to fill missing category, "Avro"
Why are the changes needed?
To fill the missing API documents.
Does this PR introduce any user-facing change?
Yes, the "Avro" section for PySpark SQL reference is added.
How was this patch tested?
The existing doc build tests should cover.