Restore example of conditional logic in expressions

[Scotchester]

Why:

Closes: #40423

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

Restores the example that I believe was accidentally removed.

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• 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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[Copilot]

Pull Request Overview

This PR restores an example demonstrating conditional logic in expressions using binary logical operators in GitHub Actions workflows. The example was previously removed and is now being added back to improve documentation clarity.

• Adds a YAML code example showing how to use && and || operators for conditional logic
• Includes explanatory text describing the conditional behavior and important considerations

[github-actions]

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Table of review links

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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 a staging server. Changes to the data directory are not included in this table.

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

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

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[Sharra-writes]

@Scotchester Yeah, I don't see a problem with this. I'll get this approved and added to the merge queue once checks are passing.

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[Scotchester]

Thank you!