[7.11] docs: add 7.11.1 release notes (#4727)

[bmorelli25]

Backports the following commits to 7.11:

• docs: add 7.11.1 release notes (docs: add 7.11.1 release notes #4727)

[apmmachine]

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• Build Cause: Pull request #4739 opened

• Start Time: 2021-02-16T16:22:17.472+0000

• Duration: 48 min 32 sec

• Commit: e9ad527

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Test	Results
Failed	0
Passed	4622
Skipped	127
Total	4749

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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