Fix of typos

README.md

@@ -436,7 +436,7 @@ git clone https://gitlab.liu.se/lrs2/lrs_ardupilot.git
 
 Make sure that the following is installed:
 ```bash
-sudo apt install ros-humble-xacro ros-humble-turtlesim ros-humble-geograhic-msgs ros-humble-gazebo-msgs python3-colcon-ros python3-colcon-bash python3-pyproj
+sudo apt install ros-humble-xacro ros-humble-turtlesim ros-humble-geographic-msgs ros-humble-gazebo-msgs python3-colcon-ros python3-colcon-bash python3-pyproj
 ```
 
 ## 2.2 Simple Example
@@ -613,7 +613,7 @@ ros2 run lrs_exec tst_command --ros-args -r __ns:=/ex0 -p command:=test-turtle-2
 
 --->
 
-### 2.4
+### 2.4 Ardupilot
 
 For how to test the ardupilot things with a copter see: https://gitlab.liu.se/lrs2/lrs_ardupilot/-/blob/main/README.md