PandasCursor tuning example passes options read_csv rejects

[laughingman7743]

Problem

The "Performance tuning options" example in docs/pandas.md passes options that pandas.read_csv does not accept, so two of its calls fail when the results are read:

cursor.execute("SELECT * FROM large_table",
               engine="pyarrow",
               chunksize=100_000,
               use_threads=True)
...
cursor.execute("SELECT * FROM data_table",
               engine="c",
               chunksize=50_000,
               buffer_lines=100_000)

PandasCursor forwards extra keyword arguments to read_csv.

• use_threads is not a read_csv parameter. Also, with chunksize set, _get_csv_engine uses the C engine even when engine="pyarrow" is requested.
• buffer_lines is not a read_csv parameter either.

Both raise TypeError: read_csv() got an unexpected keyword argument .... The engine="python", low_memory=True example does not raise.

Reproduction

The same arguments passed to pandas directly:

import io
import pandas as pd

pd.read_csv(io.StringIO("a\n1\n2\n"), engine="c", chunksize=2, use_threads=True)
# TypeError: read_csv() got an unexpected keyword argument 'use_threads'
pd.read_csv(io.StringIO("a\n1\n2\n"), engine="c", chunksize=2, buffer_lines=10)
# TypeError: read_csv() got an unexpected keyword argument 'buffer_lines'

Environment

• PyAthena master (a86a180); the same section is in v3.36.0.
• pandas 3.0.6. Neither option is a read_csv parameter in pandas 2.x either.

Proposed fix (optional)

Replace the invalid examples with options that read_csv accepts. Also state that engine="pyarrow" is not used together with chunksize, as _get_csv_engine documents. Validate with just docs lint and just docs build.

This was found in an independent review of #885.