Fix typo

stretch_gazebo/README.md

@@ -77,7 +77,7 @@ This will launch an Rviz instance that visualizes the sensors and an empty world
     roslaunch stretch_moveit_config demo_gazebo.launch
 ```
 
-This will launch an Rviz instance that visualizes the joints with markers and an empty world in Gazebo with Stretch and load all the controllers. There are pre-defined positions for each joint group for demonstration purposes. There are three joint groups, namelly *stretch_arm*, *stretch_gripper* and *stretch_head* that can be controlled individually via Motion Planning Rviz plugin. Start and goal positions for joints can be selected similar to [this moveit tutorial](https://ros-planning.github.io/moveit_tutorials/doc/quickstart_in_rviz/quickstart_in_rviz_tutorial.html#choosing-specific-start-goal-states). A few notes to be kept in mind:
+This will launch an Rviz instance that visualizes the joints with markers and an empty world in Gazebo with Stretch and load all the controllers. There are pre-defined positions for each joint group for demonstration purposes. There are three joint groups, namely *stretch_arm*, *stretch_gripper* and *stretch_head* that can be controlled individually via Motion Planning Rviz plugin. Start and goal positions for joints can be selected similar to [this moveit tutorial](https://ros-planning.github.io/moveit_tutorials/doc/quickstart_in_rviz/quickstart_in_rviz_tutorial.html#choosing-specific-start-goal-states). A few notes to be kept in mind:
 
 * Planning group can be changed via *Planning Group* drop down in Planning tab of Motion Planning Rviz plugin.
 * Pre-defined start and goal states can be speciified in *Start State* and *Goal State* drop downs in Planning tab of Motion Planning Rviz plugin.