Fixed links.

Signed-off-by: Ralph Lange <ralph.lange@de.bosch.com>

Author: ralph-lange

_docs/concepts/rtos/NuttX/index.md

@@ -19,4 +19,4 @@ Check [supported board](/docs/overview/hardware/) section for more information a
 
 ## Getting started with NuttX and micro-ROS
 
-In order to obtain more information about how to get started using this RTOS, please check our [tutorials section](/docs/tutorials/core/getting_started/).
+In order to obtain more information about how to get started using this RTOS, please check our [tutorials section](/docs/tutorials/core/first_application_rtos/).

_docs/overview/hardware/index.md

@@ -33,10 +33,7 @@ The [Olimex LTD STM32-E407](https://www.olimex.com/Products/ARM/ST/STM32-E407/op
 
 It contains 196KB of RAM and 1MB of Flash. It is a very complete board thanks to the wide variety of communication interfaces it offers: USB OTG, Ethernet, SD Card slot, SPI, CAN or I2C buses are exposed. The board contains various expansion options available: Arduino-like headers for attaching daughter boards, many pins exposed, as well as a UEXT connector. This connector is a custom pin-out bus and is used to attach sensor breakouts that manufacturer sells.
 
-Ports for micro-ROS on all supported RTOS are available for this board. Examples on how to start developing with this board are available:
- - [Zephyr](/docs/tutorials/advanced/zephyr/zephyr_getting_started/)
- - [Nuttx](/docs/tutorials/advanced/nuttx/nuttx_getting_started/)
- - [FreeRTOS](/docs/tutorials/advanced/freertos/freertos_getting_started/)
+Ports for micro-ROS on all supported RTOS are available for this board. Please see our [**First micro-ROS Application on an RTOS**](/docs/tutorials/core/first_application_rtos/) tutorial for how to start developing with this board.
 
 ### Development tools
 

_docs/tutorials/advanced/nuttx/add_microros_config/index.md

@@ -74,7 +74,7 @@ make menuconfig
 The menu below should appear:
 ![](images/nuttx_menuconfig.png)
 
-Note: Remember that you should follow this previous tutorial before starting it. [Adding Micro-ROS to a NuttX board configuration](https://micro-ros.github.io/docs/tutorials/advanced/nuttx/microros_nuttx_bsp/)
+Note: Remember that you should follow this previous tutorial before starting it. [Adding Micro-ROS to a NuttX board configuration](https://micro-ros.github.io/docs/tutorials/advanced/microros_nuttx_bsp/)
 
 In the menu, you need to set the following configuration.
 

_docs/tutorials/core/overview/index.md

@@ -14,7 +14,7 @@ If you are new to micro-ROS, we strongly suggest that you take the tutorials in
 
   This tutorial teaches you how to install the micro-ROS framework and tools. Then it will guide you to developed your own first micro-ROS application under Linux. (If you already know ROS 2, you will see that the tools are well integrated with standard ROS 2.)
 
-* [**First micro-ROS application on an RTOS**](../first_application_RTOS/)
+* [**First micro-ROS application on an RTOS**](../first_application_rtos/)
 
   In this tutorial, you will learn how to build the application from the previous tutorial for an Real-Time Operating System (RTOS). You will see how to flash a microcontroller board with the application and how to communicate with it from a microprocessor running ROS 2 on Linux. (The tutorial covers all three RTOS supported by micro-ROS, namely NuttX, FreeRTOS, and Zephyr. The choice is up to you!)