Update DeveloperGuide.md

docs/DeveloperGuide.md

@@ -302,7 +302,7 @@ Step 2. The user enters `add_app e/example@gmail.com ti/job` to add an applicati
 
 Step 3. `AddApplicationCommandParser#parse(String)` creates a new `AddApplicationCommand` object, which contains the email that a `Person` object should match, and the job title the `Job` should match. In this case, it contains `example@gmail.com` for its `email` attribute and `job` for its `title` attribute, and `PRESCREEN` for the `status` attribute by default.
 
-Step 4.`AddApplicationCommand#execute(Model)` is then called in `LogicManager#execute(String)`, where the matching `Person` and `Job` are found, and an `Application` object containing the `Person` and the `Job` is created. `model#addApplication(Application)` is then called and the `Application` is added to the list of `Application`s in `model`.
+Step 4.`AddApplicationCommand#execute(Model)` is then called in `LogicManager#execute(String)`, where the matching `Person` and `Job` are found, and an `Application` object containing the `Person` and the `Job` is created. `model#addApplication(Application)` is then called and the `Application` is added to the list of applications in `model`.
 
 **Design considerations:**