Add hyperlink to 'New SSH key' in instructions

[mcfedr]

why are there no links in the docs? its so annoying

[github-actions]

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Source	Review	Production	What Changed
authentication/connecting-to-github-with-ssh/adding-a-new-ssh-key-to-your-github-account.md	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16	fpt ghec ghes@ 3.21 3.20 3.19 3.18 3.17 3.16

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

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[Copilot]

Pull request overview

This PR updates the “Adding a new SSH key to your GitHub account” instructions to include a direct hyperlink to the New SSH key settings page, making it easier for readers to navigate to the correct UI location.

Changes:

• Adds a direct link to the “New SSH key” page in the web UI steps.