typo fix

gz_install.sh

@@ -293,7 +293,7 @@ printf '\033[32m%.0s=\033[0m' {1..75} && echo
 echo -e "\033[32m🎉 Done. Hurray! 🍎 (Apple Silicon) + 🤖 = 🚀❤️🤩🎉🥳 \033[0m"
 echo
 echo "To activate the new ROS2 Jazzy - Gazebo Harmonic framework, run the following command:"
-echo -e "\033[32msource $HOME/$VIRTUAL_ENV_ROOT/activate_ros\033[0m"
+echo -e "\033[32msource $HOME/$ROS_INSTALL_ROOT/activate_ros\033[0m"
 echo -e "\nThen, try '\033[32mros2\033[0m' or '\033[32mrviz2\033[0m' in the terminal to start ROS2 Jazzy."
 echo -e "\nTo test gazebo, \033[33mrun following commands separately in two termianls (one for server(-s) and one for gui(-g))"
 echo -e "\033[31m(IMPORTANT, both terminals should have \033[0m'source $HOME/$VIRTUAL_ENV_ROOT/activate_ros'\033[31m activated)\033[0m"