docs: update readme links to ledstrip datasheet

Author: ESP-Marius

examples/common_components/led_strip/README.md

@@ -4,7 +4,7 @@ This directory contains an implementation for addressable LEDs using the RMT per
 
 It's compatible with:
 
-* [WS2812](http://www.world-semi.com/Certifications/WS2812B.html)
+* [WS2812](https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf)
 * SK68XX
 
 This component is used as part of the following ESP-IDF examples:

examples/get-started/blink/README.md

@@ -2,7 +2,7 @@
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)
 
-This example demonstrates how to blink a LED using GPIO or RMT for the addressable LED, i.e. [WS2812](http://www.world-semi.com/Certifications/WS2812B.html).
+This example demonstrates how to blink a LED using GPIO or RMT for the addressable LED, i.e. [WS2812](https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf).
 
 See the RMT examples in the [RMT Peripheral](../../peripherals/rmt) for more information about how to use it.
 

examples/peripherals/rmt/led_strip/README.md

@@ -2,7 +2,7 @@
 
 (See the README.md file in the upper level 'examples' directory for more information about examples.)
 
-Although RMT peripheral is mainly designed for infrared remote applications, it can also support other generic protocols thanks to its flexible data format. [WS2812](http://www.world-semi.com/Certifications/WS2812B.html) is a digital RGB LED which integrates a driver circuit and a single control wire. The protocol data format defined in WS2812 is compatible to that in RMT peripheral. This example will illustrate how to drive an WS2812 LED strip based on the RMT driver.
+Although RMT peripheral is mainly designed for infrared remote applications, it can also support other generic protocols thanks to its flexible data format. [WS2812](https://cdn-shop.adafruit.com/datasheets/WS2812B.pdf) is a digital RGB LED which integrates a driver circuit and a single control wire. The protocol data format defined in WS2812 is compatible to that in RMT peripheral. This example will illustrate how to drive an WS2812 LED strip based on the RMT driver.
 
 ## How to Use Example