Merge pull request #79933 from SamDevelopsCode/softbody3d-documentation-update

Document `linear_stiffness` in SoftBody3D

doc/classes/SoftBody3D.xml

@@ -107,6 +107,7 @@
 		<member name="drag_coefficient" type="float" setter="set_drag_coefficient" getter="get_drag_coefficient" default="0.0">
 		</member>
 		<member name="linear_stiffness" type="float" setter="set_linear_stiffness" getter="get_linear_stiffness" default="0.5">
+			Higher values will result in a stiffer body, while lower values will increase the body's ability to bend. The value can be between [code]0.0[/code] and [code]1.0[/code] (inclusive).
 		</member>
 		<member name="parent_collision_ignore" type="NodePath" setter="set_parent_collision_ignore" getter="get_parent_collision_ignore" default="NodePath(&quot;&quot;)">
 			[NodePath] to a [CollisionObject3D] this SoftBody3D should avoid clipping.