EventGrid: README.md changes: Updated default tag for global settings and updates to multi-api settings.

[kalyanaj]

This checklist is used to make sure that common issues in a pull request are addressed. This will expedite the process of getting your pull request merged and avoid extra work on your part to fix issues discovered during the review process.

EventGrid: README.md changes: Updated default tag for global settings and updates to multi-api settings. Will re-enable 2018-09 tag once the service bits corresponding to this API version are deployed in all regions.

PR information

• The title of the PR is clear and informative.
• There are a small number of commits, each of which have an informative message. This means that previously merged commits do not appear in the history of the PR. For information on cleaning up the commits in your pull request, see this page.
• Except for special cases involving multiple contributors, the PR is started from a fork of the main repository, not a branch.
• If applicable, the PR references the bug/issue that it fixes.
• Swagger files are correctly named (e.g. the api-version in the path should match the api-version in the spec).

Quality of Swagger

• I have read the contribution guidelines.
• My spec meets the review criteria:
  • The spec conforms to the Swagger 2.0 specification.
  • The spec follows the guidelines described in the Swagger checklist document.
  • Validation tools were run on swagger spec(s) and have all been fixed in this PR.

[AutorestCI]

Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#2902

[AutorestCI]

Automation for azure-sdk-for-node

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-node#3631

[AutorestCI]

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[azuresdkci]

Can one of the admins verify this patch?

[anuchandy]

Talked to @kalyanaj on this, service hit some unexpected issues in the deployment for the new API version & wanted to make sure that the SDKs don’t go out until the service side deployment is complete.

[AutorestCI]

Automation for azure-sdk-for-js

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