Fix specversion casing in examples

[JoshLove-msft]

As per the CloudEvent spec, the correct casing is "specversion".

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Swagger Validation Report

️️✔️BreakingChange succeeded [Detail] [Expand]

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️️✔️Breaking Change(Cross-Version) succeeded [Detail] [Expand]

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️❌PrettierCheck: 85 Errors, 0 Warnings failed [Detail]

Only 30 items are listed, please refer to log for more details.

Rule	Message
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/keyvalue_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/keyvalue_modified.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/export_rdb_completed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/import_rdb_completed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/patching_completed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/scaling_completed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_deleted_in_thread.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_edited.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_edited_in_thread.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_received.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_message_received_in_thread.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_participant_added_to_thread_with_user.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_participant_removed_from_thread_with_user.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_created.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_created_withUser.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_participant_added.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_participant_removed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_properties_updated.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_properties_updated_per_user.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chat_thread_with_user_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/recording_file_status_updated.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/sms_delivery_report_received.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/sms_received.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/user_disconnected.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chart_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/chart_pushed.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/image_deleted.json
❌ HowToFix	Code style issues found path: 2018-01-01/examples/cloud-events-schema/image_pushed.json

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Validation passes for Lint(RPaaS).

️️✔️CadlValidation succeeded [Detail] [Expand]

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️️✔️PR Summary succeeded [Detail] [Expand]

Validation passes for Summary.

_{Posted by Swagger Pipeline | How to fix these errors?}

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Swagger Generation Artifacts

️️✔️ApiDocPreview succeeded [Detail] [Expand]

️️✔️SDK Breaking Change Tracking succeeded [Detail] [Expand]

Breaking Changes Tracking

️️✔️ azure-sdk-for-net-track2 succeeded [Detail] [Expand]

• ️✔️Succeeded [Logs]Release - Generate from 1a1463a. SDK Automation 14.0.0

  command	pwsh ./eng/scripts/Automation-Sdk-Init.ps1 ../azure-sdk-for-net_tmp/initInput.json ../azure-sdk-for-net_tmp/initOutput.json
  command	pwsh ./eng/scripts/Invoke-GenerateAndBuildV2.ps1 ../azure-sdk-for-net_tmp/generateInput.json ../azure-sdk-for-net_tmp/generateOutput.json

• ️✔️Azure.Messaging.EventGrid [View full logs]  [Release SDK Changes]
  • Azure.Messaging.EventGrid.4.14.0-alpha.20230123.1.nupkg

  info	[Changelog]

_{Posted by Swagger Pipeline | How to fix these errors?}

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Generated ApiView

Language	Package Name	ApiView Link
.Net	Azure.Messaging.EventGrid	There is no API change compared with the previous version