docs: fix broken link to image

[HonkingGoose]

Changes:

• Try to fix broken link to image

Context:

I did not see that the picture was broken after PR #11490 until now...

It works on the GitHub preview, not sure if this will work on the published site. Please check my work. 😉

Documentation (please check one with an [x])

• I have updated the documentation, or
• No documentation update is required

How I've tested my work (please tick one)

I have verified these changes via:

• Code inspection only, or
• Newly added/modified unit tests, or
• No unit tests but ran on a real repository, or
• Both unit tests + ran on a real repository

[HonkingGoose]

Would we be better off having something like this instead?

<figure>
  <img src="INSERT LINK TO IMAGE HERE" />
  <figcaption>Image of PR being automerged</figcaption>
</figure>

[rarkins]

We can try and learn.. whether it's best to use absolute URLs or relative

[renovate-release]

🎉 This PR is included in version 26.21.7 🎉

The release is available on:

• GitHub release
• 26.21.7

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