Fix rigid body damp description (3.x)

doc/classes/RigidBody.xml

@@ -108,7 +108,7 @@
 	</methods>
 	<members>
 		<member name="angular_damp" type="float" setter="set_angular_damp" getter="get_angular_damp" default="-1.0">
-			Damps RigidBody's rotational forces.
+			Damps RigidBody's rotational forces. If this value is different from -1.0 it will be added to any linear damp derived from the world or areas.
 			See [member ProjectSettings.physics/3d/default_angular_damp] for more details about damping.
 		</member>
 		<member name="angular_velocity" type="Vector3" setter="set_angular_velocity" getter="get_angular_velocity" default="Vector3( 0, 0, 0 )">
@@ -162,7 +162,7 @@
 			This is multiplied by the global 3D gravity setting found in [b]Project &gt; Project Settings &gt; Physics &gt; 3d[/b] to produce RigidBody's gravity. For example, a value of 1 will be normal gravity, 2 will apply double gravity, and 0.5 will apply half gravity to this object.
 		</member>
 		<member name="linear_damp" type="float" setter="set_linear_damp" getter="get_linear_damp" default="-1.0">
-			The body's linear damp. Cannot be less than -1.0. If this value is different from -1.0, any linear damp derived from the world or areas will be overridden.
+			The body's linear damp. Cannot be less than -1.0. If this value is different from -1.0 it will be added to any linear damp derived from the world or areas.
 			See [member ProjectSettings.physics/3d/default_linear_damp] for more details about damping.
 		</member>
 		<member name="linear_velocity" type="Vector3" setter="set_linear_velocity" getter="get_linear_velocity" default="Vector3( 0, 0, 0 )">

doc/classes/RigidBody2D.xml

@@ -94,7 +94,7 @@
 	</methods>
 	<members>
 		<member name="angular_damp" type="float" setter="set_angular_damp" getter="get_angular_damp" default="-1.0">
-			Damps the body's [member angular_velocity]. If [code]-1[/code], the body will use the [b]Default Angular Damp[/b] defined in [b]Project &gt; Project Settings &gt; Physics &gt; 2d[/b].
+			Damps the body's [member angular_velocity]. If [code]-1[/code], the body will use the [b]Default Angular Damp[/b] defined in [b]Project &gt; Project Settings &gt; Physics &gt; 2d[/b]. If greater than [code]-1[/code] it will be added to the default project value.
 			See [member ProjectSettings.physics/2d/default_angular_damp] for more details about damping.
 		</member>
 		<member name="angular_velocity" type="float" setter="set_angular_velocity" getter="get_angular_velocity" default="0.0">
@@ -139,7 +139,7 @@
 			The body's moment of inertia. This is like mass, but for rotation: it determines how much torque it takes to rotate the body. The moment of inertia is usually computed automatically from the mass and the shapes, but this function allows you to set a custom value. Set 0 inertia to return to automatically computing it.
 		</member>
 		<member name="linear_damp" type="float" setter="set_linear_damp" getter="get_linear_damp" default="-1.0">
-			Damps the body's [member linear_velocity]. If [code]-1[/code], the body will use the [b]Default Linear Damp[/b] in [b]Project &gt; Project Settings &gt; Physics &gt; 2d[/b].
+			Damps the body's [member linear_velocity]. If [code]-1[/code], the body will use the [b]Default Linear Damp[/b] in [b]Project &gt; Project Settings &gt; Physics &gt; 2d[/b]. If greater than [code]-1[/code] it will be added to the default project value.
 			See [member ProjectSettings.physics/2d/default_linear_damp] for more details about damping.
 		</member>
 		<member name="linear_velocity" type="Vector2" setter="set_linear_velocity" getter="get_linear_velocity" default="Vector2( 0, 0 )">