Fix image_version workflow trigger name

[rhysd]

Why:

Closes: #41266

What's being changed (if available, include any code snippets, screenshots, or gifs):

Fixed the trigger name. image_version is correct.

https://github.com/actions/runner/blob/b3a60e6b0630a15b2daa549429b9ae2cf19f4400/src/Sdk/WorkflowParser/workflow-v1.0.json#L322

Check off the following:

• A subject matter expert (SME) has reviewed the technical accuracy of the content in this PR. In most cases, the author can be the SME. Open source contributions may require an SME review from GitHub staff.
• The changes in this PR meet the docs fundamentals that are required for all content.
• All CI checks are passing and the changes look good in the review environment.

[github-actions]

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Source	Review	Production	What Changed
actions/reference/workflows-and-actions/events-that-trigger-workflows.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

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[Copilot]

Pull Request Overview

This PR fixes an incorrect workflow trigger name in the GitHub Actions documentation. The heading was incorrectly named image_version_ready without backticks, when it should be `image_version` to match both the actual event name used in workflow YAML and the formatting convention used for all other event headings in the document.

Key Changes

• Corrected the event name from image_version_ready to image_version to match the workflow syntax shown in the code example
• Added backticks around the event name to follow the established formatting pattern used for all other event headings in the document

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[Sharra-writes]

@rhysd Copilot agrees, and since this is a small change I'm going to accept it on the theory that if it's actually wrong, someone will come let me know pretty quickly.

[github-actions]

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