Clarify rotation degrees

doc/classes/Control.xml

@@ -1001,6 +1001,7 @@
 		</member>
 		<member name="rotation" type="float" setter="set_rotation" getter="get_rotation" default="0.0">
 			The node's rotation around its pivot, in radians. See [member pivot_offset] to change the pivot's position.
+			[b]Note:[/b] This property is edited in the inspector in degrees. If you want to use degrees in a script, use [member rotation_degrees].
 		</member>
 		<member name="rotation_degrees" type="float" setter="set_rotation_degrees" getter="get_rotation_degrees">
 			Helper property to access [member rotation] in degrees instead of radians.

doc/classes/Node2D.xml

@@ -116,6 +116,7 @@
 		</member>
 		<member name="rotation" type="float" setter="set_rotation" getter="get_rotation" default="0.0">
 			Rotation in radians, relative to the node's parent.
+			[b]Note:[/b] This property is edited in the inspector in degrees. If you want to use degrees in a script, use [member rotation_degrees].
 		</member>
 		<member name="rotation_degrees" type="float" setter="set_rotation_degrees" getter="get_rotation_degrees">
 			Helper property to access [member rotation] in degrees instead of radians.

doc/classes/Node3D.xml

@@ -289,6 +289,7 @@
 		<member name="rotation" type="Vector3" setter="set_rotation" getter="get_rotation" default="Vector3(0, 0, 0)">
 			Rotation part of the local transformation in radians, specified in terms of Euler angles. The angles construct a rotaton in the order specified by the [member rotation_order] property.
 			[b]Note:[/b] In the mathematical sense, rotation is a matrix and not a vector. The three Euler angles, which are the three independent parameters of the Euler-angle parametrization of the rotation matrix, are stored in a [Vector3] data structure not because the rotation is a vector, but only because [Vector3] exists as a convenient data-structure to store 3 floating-point numbers. Therefore, applying affine operations on the rotation "vector" is not meaningful.
+			[b]Note:[/b] This property is edited in the inspector in degrees. If you want to use degrees in a script, use [member rotation_degrees].
 		</member>
 		<member name="rotation_degrees" type="Vector3" setter="set_rotation_degrees" getter="get_rotation_degrees">
 			Helper property to access [member rotation] in degrees instead of radians.