docs: Bed_Mesh.md Correction

[nuburt]

mesh_max of (240,198) with 24,5 offset is (216,193) not (206,193)

[JamesH1978]

Thank you for submitting a PR, pleas refer to point 3 in "What to expect in a review" in https://github.com/Klipper3d/klipper/blob/master/docs/CONTRIBUTING.md and provide a signed off by line.

Thanks
James

[github-actions]

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1. Perform a self-review of your Pull Request by following the steps at: https://www.klipper3d.org/CONTRIBUTING.html#what-to-expect-in-a-review
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