Turtlebot3.md

@@ -245,9 +245,9 @@ In second, we define the gazebo environment:
 + with user interface `<arg name="gui" value="true"/>`
 
 In last, we configure the robot deployment using group syntax: 
-+ label of the namspace `<group ns = "$(arg first_tb3)">`
++ label of the namespace `<group ns = "$(arg first_tb3)">`
 + robot urdf `<param name="robot_description" command="$(find xacro)/xacro $(find turtlebot3_description)/urdf/turtlebot3_$(arg model).urdf.xacro" />`
-+ robot intialization 
++ robot intialization with tf_prefix for robot topics
 ```
 <node pkg="robot_state_publisher" type="robot_state_publisher" name="robot_state_publisher" output="screen">
   <param name="publish_frequency" type="double" value="50.0" />