Clarify that angles must be specified as radians in the documentation

This closes #36356.

(cherry picked from commit cae5260dab0d6c8d705218ea1f44aeef4cbd17fb)

doc/classes/CanvasItem.xml

@@ -9,6 +9,7 @@
 		Canvas items are drawn in tree order. By default, children are on top of their parents so a root [CanvasItem] will be drawn behind everything. This behavior can be changed on a per-item basis.
 		A [CanvasItem] can also be hidden, which will also hide its children. It provides many ways to change parameters such as modulation (for itself and its children) and self modulation (only for itself), as well as its blend mode.
 		Ultimately, a transform notification can be requested, which will notify the node that its global position changed in case the parent tree changed.
+		[b]Note:[/b] Unless otherwise specified, all methods that have angle parameters must have angles specified as [i]radians[/i]. To convert degrees to radians, use [method @GDScript.deg2rad].
 	</description>
 	<tutorials>
 		<link>https://docs.godotengine.org/en/latest/tutorials/2d/2d_transforms.html</link>

doc/classes/Spatial.xml

@@ -6,6 +6,7 @@
 	<description>
 		Most basic 3D game object, with a 3D [Transform] and visibility settings. All other 3D game objects inherit from Spatial. Use [Spatial] as a parent node to move, scale, rotate and show/hide children in a 3D project.
 		Affine operations (rotate, scale, translate) happen in parent's local coordinate system, unless the [Spatial] object is set as top-level. Affine operations in this coordinate system correspond to direct affine operations on the [Spatial]'s transform. The word local below refers to this coordinate system. The coordinate system that is attached to the [Spatial] object itself is referred to as object-local coordinate system.
+		[b]Note:[/b] Unless otherwise specified, all methods that have angle parameters must have angles specified as [i]radians[/i]. To convert degrees to radians, use [method @GDScript.deg2rad].
 	</description>
 	<tutorials>
 		<link>https://docs.godotengine.org/en/latest/tutorials/3d/introduction_to_3d.html</link>