Add documentation on on.workflow_run.workflows

[EnricoMi]

Why:

The values of on.workflow_run.workflows are treated as glob patterns. Special characters requires escaping.

Details:
https://github.com/orgs/community/discussions/50835
actions/runner#3763

Closes: #12572

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

Adds documentation for on.workflow_run.workflows, especially around glob patterns.

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.

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[github-actions]

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The table shows the files in the content directory that were changed in this pull request. This helps you review your changes on the review server. Changes to the data directory are not included in this table.

Source	Review	Production	What Changed
actions/writing-workflows/workflow-syntax-for-github-actions.md	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12	fpt ghec ghes@ 3.16 3.15 3.14 3.13 3.12

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[github-actions]

Thanks for opening a pull request! We've triaged this issue for technical review by a subject matter expert 👀

[Sharra-writes]

Thanks so much for opening a PR! I'll get this triaged for review.