DOC: Reference to type 'pd_table' in IO Tools User Guide
Insertion Method section of the reference refers to "pd_table" in the function signature. This is the only place it is used in the whole documentation. Search engines results for "pd_table" are mostly examples where it's used to refer to pd.DataFrame, so it's rather confusing.

Not sure what's the best way to make this clear but the signature should refer to `pandas.io.SQLTable()`.

This was added in #21401. I came across this while working on #26795.