Fix image paths

Author: Fasermaler

ROS_SMACH/SMACH_Reference.md

@@ -101,7 +101,7 @@ Additionally, SMACH can be used with ROS Actions to allow for increased code mod
 
 Convert state-less systems into state-based ones (depends on whether that is what you are looking for).
 
-![Untitled Diagram2](assets/Untitled Diagram2.jpg)
+![UntitledDiagram2](assets/UntitledDiagram2.jpg)
 
 ## 2 Simple State Machine Example <a name="2"></a>
 
@@ -154,7 +154,7 @@ with sm:
 In each line, we add a new state, define the state name and what state class we are using (in this case `ExampleState()`) and then we assign the outcome with a new state or in the case of the last state, an outcome of the state machine.
 Without going further, you should be able to tell what would happen if we were to execute this state machine. The following is a simple diagram:
 
-![Untitled Diagram](assets/Untitled Diagram.jpg)
+![UntitledDiagram](assets/UntitledDiagram.jpg)
 
 ### 2.4 Full Example <a name="2.4"></a>