fix path readme

Signed-off-by: Van Malleghem Antoine <[email protected]>

README.md

@@ -75,9 +75,11 @@ A workaround is to define the environment variable
 `GZ_CONFIG_PATH` to point to the different locations of the Gazebo libraries installations,
 where the YAML files for the packages are found, such as
 ```
-export GZ_CONFIG_PATH=/usr/local/share/gz:$HOME/.gz/tools/configs
+export GZ_CONFIG_PATH=/usr/local/share/gz:$HOME/ws/install/share/gz
 ```
 
+where `$HOME/ws` is an example colcon workspace used to build Gazebo
+
 # Documentation
 
 See the [installation tutorial](https://gazebosim.org/api/launch/8/install.html).