Specify description of Array.slices end parameter

doc/classes/Array.xml

@@ -495,7 +495,7 @@
 			<argument index="2" name="step" type="int" default="1" />
 			<argument index="3" name="deep" type="bool" default="false" />
 			<description>
-				Duplicates the subset described in the function and returns it in an array, deeply copying the array if [code]deep[/code] is [code]true[/code]. Lower and upper index are inclusive, with the [code]step[/code] describing the change between indices while slicing.
+				Duplicates the subset described in the function and returns it in an array, deeply copying the array if [code]deep[/code] is [code]true[/code]. Lower and upper index are inclusive, with the [code]step[/code] describing the change between indices while slicing. If [code]end[/code] is an invalid value, the end of the array is used.
 			</description>
 		</method>
 		<method name="sort">