[Developer Documentation] fix link url

[michakrapp]

What?

Fix a link in the create your first block tutorial.

Why?

Link is pointing to the wrong page.

How?

Change the link url href.

Testing Instructions

1. Open the page
2. Click the link
3. See that you are on the correct page (Get started with create-block)

Testing Instructions for Keyboard

Same as testing with the keyboard

[github-actions]

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Co-authored-by: michakrapp <mfgmicha@git.wordpress.org>
Co-authored-by: juanmaguitar <juanmaguitar@git.wordpress.org>

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[github-actions]

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[juanmaguitar]

Good catch! Thanks for the fix 👍