docs: use reusable for checkout action instead of hardcoded version

[AeternalNull]

Why:

Closes: N/A

The current documentation hardcodes actions/checkout@v4, while the latest version is v5. This can lead to inconsistencies and outdated references in the docs.

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

This PR updates the example workflow to replace a hardcoded action version with a reusable reference.

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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Table of review links

Note: Please update the URL for your staging server or codespace.

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

Source	Review	Production	What Changed
actions/tutorials/create-an-example-workflow.md	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.20 3.19 3.18 3.17 3.16 3.15 3.14	from reusable

Key: fpt: Free, Pro, Team; ghec: GitHub Enterprise Cloud; ghes: GitHub Enterprise Server

🤖 This comment is automatically generated.

[Sharra-writes]

@AeternalNull I think this is fine since you're using a variable that the example is using. I just added in a missing "the," and once these checks pass I'll get it merged.

[github-actions]

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