Apply ralph-lange's suggestions

Co-authored-by: Ralph Lange <ralph-lange@users.noreply.github.com>

Author: 4ntn

_docs/tutorials/core/first_application_linux/index.md

@@ -63,9 +63,9 @@ source install/local_setup.bash
 ```
 {% include first_application_common/agent_creation.md %}
 
-### Add microros environment to bashrc (optional)
+### Add micro-ROS environment to bashrc (optional)
 
-You can add the ROS2 and microROS workspace setup files to your bashrc so the files do not have to be sourced everytime a new command line is opened
+You can add the ROS 2 and micro-ROS workspace setup files to your `.bashrc` so the files do not have to be sourced every time a new command line is opened.
 ```bash
 echo source /opt/ros/$ROS_DISTRO/setup.bash >> ~/.bashrc
 echo source ~/microros_ws/install/local_setup.bash >> ~/.bashrc