[Enhancement]: Inconsistent dataFeed and priceFeed variable naming

[darrensapalo]

What would you like us to improve?

The documentation says "priceFeed" but the code example uses "dataFeed".

See: here

I think the documentation should follow the code (i.e. change priceFeed to dataFeed), as the code snippet might be used in other areas of the documentation.

How important it is?

Fixing this will reduce confusion from newbies reading the how-to documentation.