Fix formatting in dependabot docs

[muzimuzhi]

Why:

Closes: #41512

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

Added a missing quotation mark.

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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Source	Review	Production	What Changed
code-security/dependabot/dependabot-version-updates/customizing-dependabot-prs.md	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14	fpt ghec ghes@ 3.18 3.17 3.16 3.15 3.14

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[Copilot]

Pull request overview

This PR fixes a formatting issue in the Dependabot documentation by adding a missing opening quotation mark to properly display a string value in a code comment.

Key Changes

• Added opening quotation mark to the comment on line 166 to properly show the complete prefix string "[docker] " including the trailing whitespace

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[Sharra-writes]

@muzimuzhi Thanks for the fix! We're on a deploy freeze for US Thanksgiving since so many people are on vacation, but I've marked this for next week so I'll know it's good to go. 👍