[7.x] docs/spec: require duration >= 0 (#3721)

[axw]

Backports the following commits to 7.x:

• docs/spec: require duration >= 0 (docs/spec: require duration >= 0 #3721)

[ghost]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request [7.x] docs/spec: require duration >= 0 (#3721) #3741 opened]

• Start Time: 2020-05-05T03:10:55.664+0000

• Duration: 26 min 27 sec (1586722)

• Commit: 4073331

Test stats 🧪

Test	Results
Failed	0
Passed	2999
Skipped	139
Total	3138

Steps errors

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• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Result: FAILURE

  • Duration: 3 min 40 sec<

  • Start Time: 2020-05-05T03:20:36.429+0000

[simitt]

tested for requests against
intake/v3/rum/events
intake/v2/rum/events
intake/v2/events