Describe linked issues can use trailer syntax

[lumynou5]

Why:

Closes: #36608

The current document doesn't mention the keywords and the issue numbers can be separated by colons like Git trailer convention to link pull requests to issues.

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

The description about that is added to the document.

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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Source	Review	Production	What Changed
issues/tracking-your-work-with-issues/using-issues/linking-a-pull-request-to-an-issue.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 raising a PR and linking it to your issue, @lumynou5—I agree this is worth mentioning, but I've just made an edit to bring the information in line with our style guide. I've applied that and I'll merge this shortly. Thanks for your interest in the GitHub docs!

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