[Monitor] Adding proper error response behavior to the Action Groups API. Fixing documentation typos in the Activity Log Alerts and Action Groups APIs.

[gucalder]

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[gucalder]

Second part of the, now closed, PR #1614. This part includes only changes to resource-manager.
First part is PR #1620.

[azuresdkciprbot]

Hi There,

I am the AutoRest Linter Azure bot. I am here to help. My task is to analyze the situation from the AutoRest linter perspective. Please review the below analysis result:

File: specification/monitor/resource-manager/readme.md
Before the PR: Warning(s): 23 Error(s): 10
After the PR: Warning(s): 23 Error(s): 10

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[sergey-shandar]

LGTM. Only error messages and error structure is added.

[AutorestCI]

No modification for AutorestCI/azure-sdk-for-node

[AutorestCI]

Azure/azure-sdk-for-python#1408