updated basic effects example in docs

Author: jath03

docs/pages/effects.rst

@@ -31,12 +31,15 @@ for setting a device to a rainbow color.
 .. code-block:: python
 
     from openrgb import OpenRGBClient
-    from openrgb.utils import RGBColor
+    from openrgb.utils import RGBColor, ZoneType
 
     cli = OpenRGBClient()
 
-    # dividing the color spectrum by number of LEDs
-    step = int(len(cli.ee_devices[0].colors)/360)
+    # finding a linear zone
+    zone = next(z for dev in cli.ee_devices for z in dev.zones if z.type == ZoneType.LINEAR)
+    # dividing the color spectrum by number of LEDs in the zone
+    step = int(360/len(zone.colors))
+    # Setting the zones colors to the entire spectrum of the rainbow
     for i, hue in enumerate(range(0, 360, step)):
-        cli.ee_devices[0].colors[i] = RGBColor.fromHSV(hue, 100, 100)
-    cli.ee_devices[0].show()
+        zone.colors[i] = RGBColor.fromHSV(hue, 100, 100)
+    zone.show()