[DOCS] Sync classref with current source

doc/classes/Sprite.xml

@@ -11,6 +11,13 @@
 	<demos>
 	</demos>
 	<methods>
+		<method name="get_rect" qualifiers="const">
+			<return type="Rect2">
+			</return>
+			<description>
+				Returns a Rect2 representing the Sprite's boundary relative to its local coordinates.
+			</description>
+		</method>
 	</methods>
 	<members>
 		<member name="centered" type="bool" setter="set_centered" getter="is_centered">