changed BUILTIN_LED to LED_BUILTIN

Author: tuxedo0801

libraries/esp8266/examples/BlinkWithoutDelay/BlinkWithoutDelay.ino

@@ -7,7 +7,7 @@
  The blue LED on the ESP-01 module is connected to GPIO1 
  (which is also the TXD pin; so we cannot use Serial.print() at the same time)
  
- Note that this sketch uses BUILTIN_LED to find the pin with the internal LED
+ Note that this sketch uses LED_BUILTIN to find the pin with the internal LED
 */
 
 int ledState = LOW;