Update Delta_Calibrate.md

[chexxor]

Clarify delta calibration and geometry.

I had an issue with calibrating my delta printer, specifically on troubleshooting X-Y dimensions that were 88% of their target size. It was largely due to my misunderstanding of the delta geometry.

I was confused on what "delta_radius" means in klipper. It could mean bed radius or print area radius, but it is actually referring very exactly to delta kinematics-specific geometry. It is the X-Y distance between arm centers when in the parked position. The RepRap page on the topic is a useful place to learn a bit more about it.

This change provides an idea of a symptom of incorrect X, Y dimensional accuracy and provide a lead towards fixing it.

Signed-off-by: Alex Berg [email protected]

[KevinOConnor]

Thanks. In general, it seems fine to me. However, links to other documents should use relative links - replace [Config_Reference](https://www.klipper3d.org/Config_Reference.html#common-kinematic-settings) with [Config_Reference](Config_Reference.md#common-kinematic-settings).

-Kevin

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