Fix: Correct Issue Reference to Pull Request in Actions Security Docs

[atxtechbro]

Why:

changes a reference to an issue to a pull_request to be consistent with the example in the documentation about GitHub actions security best practices. This will make consumers of the documentation more likely to find the article helpful and promote better GitHub actions security awareness regarding GitHub actions.

Closes: will make issue

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

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

Source	Review	Production	What Changed
actions/security-for-github-actions/security-guides/security-hardening-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

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

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[subatoi]

Thanks for spotting and fixing that, @atxtechbro! I'll get that merged for you now. Thanks for your interest in the GitHub docs ✨

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[Dawnmarie-2578]

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