Minor format edits to file

gazebo_basics.md

@@ -2,7 +2,7 @@
 
 ### Empty World Simulation
 To spawn the Stretch in gazebo's default empty world run the following command in your terminal.
-```bash
+```
 roslaunch stretch_gazebo gazebo.launch
 ```
 This will bringup the robot in the gazebo simulation similar to the image shown below.
@@ -12,14 +12,14 @@ This will bringup the robot in the gazebo simulation similar to the image shown
 
 ### Custom World Simulation
 In gazebo, you are able to spawn Stretch in various worlds. First, source the gazebo world files by running the following command in a terminal
-```BASH
+```
 echo "source /usr/share/gazebo/setup.sh"
 ```
 
 
 Then using the world argument, you can spawn the stretch in the willowgarage world by running the following
 
-```bash
+```
 roslaunch stretch_gazebo gazebo.launch world:=worlds/willowgarage.world
 ```