Fix minor bugs

Author: ssoonwee

docs/DeveloperGuide.md

@@ -100,7 +100,7 @@ For example, the `Logic` component (see the class diagram given below) defines i
 
 **How the architecture components interact with each other**
 
-The *Sequence Diagram* below shows how the components interact with each other for the scenario where the user issues the command `food_delete n\grape`.
+The *Sequence Diagram* below shows how the components interact with each other for the scenario where the user issues the command `food_delete n/grape`.
 
 <img src="images/ArchitectureSequenceDiagram.png" width="574" />