Fix stream name mismatch in code and the text

[sJJdGG]

in the code above the suggested diff, the stream name is race:france which is coherent with all the other example in the doc. but it's wrongly named mystream

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[dwdougherty]

Thank you, Sajjad, for the PR.

There are two other occurrences of "mystream" that need to be changed. The first is in the same paragraph you mentioned, line 329. The other is on line 435, where "mystream" should be changed to "race:italy". Can you make these other two changes to this PR?

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