Fix URL

pablogs9 · pablogs9 · commit c8ba8e757217 · 2020-03-18T13:10:09.000+01:00
diff --git a/_docs/concepts/rtos/comparison/index.md b/_docs/concepts/rtos/comparison/index.md
@@ -98,4 +98,4 @@ Table:
 
 Some Related Work:
 * [Choosing the right RTOS for IoT platform, Milinkovic et al, INFOTEH-JAHORINA Vol. 14, 2015](http://infoteh.rs.ba/zbornik/2015/radovi/RSS-2/RSS-2-2.pdf): comparison of FreeRTOS, ChibiOS/RT, Erika, RIOT
-* [FreeRTOS Architecture](http://www.aosabook.org/en/freertos.html)
+* [FreeRTOS Architecture](https://www.freertos.org/)
