[7.x] docs/spec: fix JSON Schema for arrays of objects (#4516)

[simitt]

Backports the following commits to 7.x:

• docs/spec: fix JSON Schema for arrays of objects (docs/spec: fix JSON Schema for arrays of objects #4516)

[apmmachine]

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Build stats

• Build Cause: Pull request #4551 updated

• Start Time: 2020-12-15T19:34:03.068+0000

• Duration: 30 min 20 sec

Test stats 🧪

Test	Results
Failed	0
Passed	4396
Skipped	140
Total	4536

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• Description: tar --exclude=coverage-files.tgz -czf coverage-files.tgz coverage

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• Description: tar --exclude=system-tests-linux-files.tgz -czf system-tests-linux-files.tgz system-tests

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