Add a link to the Python ECS logging tutorial in the Cloud docs

[kilfoyle]

This adds a link to a new Python ECS logging tutorial in the Cloud docs.

@bmorelli25, or anyone, please let me know if you think there might be a better place for this link.

Please see also elastic/ecs-logging-nodejs#99

[apmmachine]

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• Start Time: 2021-09-10T20:08:59.154+0000

• Duration: 8 min 42 sec

• Commit: 1acfa66

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Failed	0
Passed	205
Skipped	4
Total	209

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[bmorelli25]

Jenkins, run the tests please

[bmorelli25]

Niiice!

I don't know why Auto Assign to Project(s) / Assign milestoned to Project (pull_request_target) is failing. I hoped adding the 7.15 milestone would fix that, but it doesn't seem to be. I'll tag in someone else to take a look. edit: it worked