DOC: read_sql_query docstring contraine wrong examples

[Tonow]

The issuse is a line :

pandas/pandas/io/sql.py

Line 477 in 73fd026

... data = pd.read_sql_table("data", conn) # doctest: +SKIP

The example is for the wrong function s/read_sql_table/read_sql_query

    Examples
    --------
    >>> from sqlalchemy import create_engine  # doctest: +SKIP
    >>> engine = create_engine("sqlite:///database.db")  # doctest: +SKIP
    >>> with engine.connect() as conn, conn.begin():  # doctest: +SKIP
    ...     data = pd.read_sql_table("data", conn)  # doctest: +SKIP

Should be replace by somthing like

    Examples
    --------
    >>> from sqlalchemy import create_engine  # doctest: +SKIP
    >>> engine = create_engine("sqlite:///database.db")  # doctest: +SKIP
    >>> sql_query = 'SELECT int_column FROM test_data  # doctest: +SKIP
    >>> with engine.connect() as conn, conn.begin():  # doctest: +SKIP
    ...     data = pd.read_sql_query(sql_query, conn)  # doctest: +SKIP

And this will modify https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.read_sql_query.html