fix: dead link to register to exams

[SkohTV]

Why:

Dead link to register to Github certifications exam on https://docs.github.com/en/get-started/showcase-your-expertise-with-github-certifications/registering-for-a-github-certifications-exam

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

Changed the link to match the sibling page https://docs.github.com/en/get-started/showcase-your-expertise-with-github-certifications/about-github-certifications
(and thus not be broken anymore)

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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[Copilot]

Pull Request Overview

This PR fixes a broken link in the GitHub certifications documentation by updating the registration URL to point to the correct GitHub Learn credentials page instead of the non-functional examregistration.github.com domain.

• Updated the registration link URL from https://examregistration.github.com/overview to https://learn.github.com/credentials

[github-actions]

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Table of review links

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Source	Review	Production	What Changed
get-started/showcase-your-expertise-with-github-certifications/registering-for-a-github-certifications-exam.md	fpt ghec	fpt ghec

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

🤖 This comment is automatically generated.

[Sharra-writes]

@SkohTV Looks good, thanks for catching that!

[github-actions]

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