Document `Vector2.from_angle()` not always returning a normalized vector

doc/classes/Vector2.xml

@@ -211,12 +211,13 @@
 			<return type="Vector2" />
 			<param index="0" name="angle" type="float" />
 			<description>
-				Creates a unit [Vector2] rotated to the given [param angle] in radians. This is equivalent to doing [code]Vector2(cos(angle), sin(angle))[/code] or [code]Vector2.RIGHT.rotated(angle)[/code].
+				Creates a [Vector2] rotated to the given [param angle] in radians. This is equivalent to doing [code]Vector2(cos(angle), sin(angle))[/code] or [code]Vector2.RIGHT.rotated(angle)[/code].
 				[codeblock]
 				print(Vector2.from_angle(0)) # Prints (1.0, 0.0)
 				print(Vector2(1, 0).angle()) # Prints 0.0, which is the angle used above.
 				print(Vector2.from_angle(PI / 2)) # Prints (0.0, 1.0)
 				[/codeblock]
+				[b]Note:[/b] The length of the returned [Vector2] is [i]approximately[/i] [code]1.0[/code], but is is not guaranteed to be exactly [code]1.0[/code] due to floating-point precision issues. Call [method normalized] on the returned [Vector2] if you require a unit vector.
 			</description>
 		</method>
 		<method name="is_equal_approx" qualifiers="const">