[Docs RFC]Update the import time series data page

[billy-the-fish]

I am walking through the documentation on timescale, doing some of the examples. I'm on this page: https://docs.timescale.com/getting-started/latest/time-series-data/ and when i import the data, no errors. the next page talks about a query where the day_volume column is not null. however, the data csv on the site left day_volume null for all rows. this is the file the article links to: https://assets.timescale.com/docs/downloads/get-started/real_time_stock_data.zip Edit: looking further, it doesn't appear day_volume is used in any of the subsequent steps, price is used. maybe just need to update the example on the site to use a different field? (edited)