Manual Content: `physics_joint_weld_create()` page needs to say the "ref_angle" argument uses radians

[ClayRecords]

What is the bug?

The documentation for the ref_angle argument to the function physics_joint_weld_create says the following:

ref_angle	Real	The joint angle to maintain

This doesn't mention that the angle should be in radians, not degrees. This is pretty confusing because the rest of the project uses degrees!

I know I wasted many hours trying to debug this myself, and found another user in the following video who had to plug in random numbers before it worked. I was able to figure out it was in radians from there. https://www.youtube.com/watch?v=Sr86K69g3Mk

Ideally the ref_angle would be changed to use degrees, but the documentation could also be updated to specify radians as a unit like it does on this other page.

Manual Link

https://manual.gamemaker.io/monthly/en/#t=GameMaker_Language%2FGML_Reference%2FPhysics%2FJoints%2Fphysics_joint_weld_create.htm

[ClayRecords]

After further investigation, I think this ALSO an issue with how physics_joint_weld_create() works entirely!
The documentation should still be updated, but there is a larger problem. Tracking that here.

[jackerley]

The underlying physics function had a bug in it that was converting the angle the wrong way. It now expects the angle in degrees as per other physics functions (manual should probably be updated to reflect this. As per #14255