EventGrid (2020-06-10 and 2020-10-15-preview): Swagger Correctness --- Fix swagger for setting readonly for privateEndpointConnections for topic, domain properties

[ahamad-MS]

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[openapi-workflow-bot]

Hi @ahamad-MS, one or multiple breaking change(s) is detected in your PR. Please check out the breaking change(s), and provide business justification in the PR comment and @ PR assignee why you must have these change(s), and how external customer impact can be mitigated. Please ensure to follow breaking change policy to request breaking change review and approval before proceeding swagger PR review.
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If you think it is false positive breaking change, please provide the reasons in the PR comment, report to Swagger Tooling Team via https://aka.ms/swaggerfeedback.

[ahamad-MS]

Thank you @JeffreyRichter for the approval.
@njuCZ Can you please help merge it?

Thanks