Examples: Low power, fix typo of a comment

Author: marqdevx

examples/Low_Power/Low_Power.ino

@@ -31,7 +31,7 @@ void setup() {
   delay(2500);  
   // Brigtness does not change the Max Current, you control the PWM duty cycle of the APA102
   // With the same Max current set in 2 LEDs, you can see different phyisical brightness
-  // depending on the use of each or combination of the internal rgb LEDs wich each APA102 component has
+  // depending on the use of each or combination of the internal rgb LEDs which each APA102 component has
   // You can see the effect:
   //
   // Current can be set from 0-31