Add links to tutorial

ros2/navigation_stack.md

@@ -1,7 +1,7 @@
 # Nav2 Stack Using RViz
-In this tutorial, we will explore the ROS 2 navigation stack using slam_toolbox for mapping an environment and the core Nav2 packages to navigate in the mapped environment. If you want to know more about teleoperating the mobile base or working with the RPlidar 2D scanner on Stretch and how to get it up and running, we recommend visiting the previous tutorials on teleoperating stretch and laser scanner. These topics are a vital part of how Stretch's mobile base can be velocity controlled using Twist messages, and how the RPlidar's LaserScan messages enable obstacle avoidance for autonomous navigation.
+In this tutorial, we will explore the ROS 2 navigation stack using slam_toolbox for mapping an environment and the core Nav2 packages to navigate in the mapped environment. If you want to know more about teleoperating the mobile base or working with the RPlidar 2D scanner on Stretch, we recommend visiting the previous tutorials on [Teleoperating](https://docs.hello-robot.com/0.2/stretch-tutorials/ros2/example_1/) stretch and [Filtering Laser Scansn>](https://docs.hello-robot.com/0.2/stretch-tutorials/ros2/example_2/). These topics are a vital part of how Stretch's mobile base can be velocity controlled using Twist messages, and how the RPlidar's LaserScan messages enable [Obstacle Avoidance](https://docs.hello-robot.com/0.2/stretch-tutorials/ros2/obstacle_avoider/) for autonomous navigation.
 
-Navigation is a key aspect of an autonomous agent because, often, to do anything meaningful, the agent needs to traverse an environment to reach a specific spot to perform a specific task. With an assistive robot like Stretch, the task could be anything from delivering water or medicines for the elderly to performing a routine patrol of an establishment for security.
+Navigation is a key aspect of an autonomous agent because, often, to do anything meaningful, the agent needs to traverse an environment to reach a specific spot to perform a specific task. With a robot like Stretch, the task could be anything from delivering water or medicines for the elderly to performing a routine patrol of an establishment for security.
 
 Stretch's mobile base enables this capability and this tutorial will explore how we can autonomously plan and execute mobile base trajectories. Running this tutorial will require the robot to be untethered, so please ensure that the robot is adequetly charged.