Fix img numbers, Add link to commons and remove out-of-place full stop

docs/DeveloperGuide.md

@@ -97,7 +97,7 @@ command `delete 3`.
 
 <img src="images\SDforDeleteTask.png" width="800">
 
-<center><sub>Fig 3: Sequence Diagram for Delete Task</sub></center>
+<center><sub>Fig 2: Sequence Diagram for Delete Task</sub></center>
 
 >Note how the `Model` simply raises a `TaskManagerChangedEvent` when the Task Manager data are changed,
  instead of asking the `Storage` to save the updates to the hard disk.
@@ -107,7 +107,7 @@ being saved to the hard disk and the status bar of the `UI` being updated to ref
 
 <img src="images\SDforDeleteTaskEventHandling.png" width="800">
 
-<center><sub>Fig 4: Sequence Diagram for Event Handling for Delete Task</sub></center>
+<center><sub>Fig 3: Sequence Diagram for Event Handling for Delete Task</sub></center>
 
 > Note how the event is propagated through the `EventsCenter` to the `Storage` and `UI` without `Model` having
   to be coupled to either of them. This is an example of how this Event Driven approach helps us reduce direct
@@ -118,7 +118,7 @@ The sections below give more details of each component.
 ### `UI` component
 
 <img src="images/UiClassDiagram.png" width="800">
-<center><sub>Fig 5: Class Diagram for UI component</sub></center>
+<center><sub>Fig 4: Class Diagram for UI component</sub></center>
 
 **API** : [`Ui.java`](../src/main/java/seedu/manager/ui/Ui.java)
 
@@ -138,7 +138,7 @@ The `UI`,
 ### Logic component
 
 <img src="images/LogicClassDiagram.png" width="800">
-<center><sub>Fig 6: Class Diagram for Logic component</sub></center>
+<center><sub>Fig 5: Class Diagram for Logic component</sub></center>
 
 **API** : [`Logic.java`](../src/main/java/seedu/manager/logic/Logic.java)
 
@@ -153,12 +153,12 @@ Given below is the Sequence Diagram for interactions within the `Logic` componen
  API call.<br><br>
 <img src="images/DeleteTaskSdForLogic.png" width="800"><br>
 
-<center><sub>Fig 7: Sequence Diagram for Delete command in Logic component</sub></center>
+<center><sub>Fig 6: Sequence Diagram for Delete command in Logic component</sub></center>
 
 ### Model component
 
 <img src="images/ModelClassDiagram.png" width="800">
-<center><sub>Fig 8: Class Diagram for Model component</sub></center>
+<center><sub>Fig 7: Class Diagram for Model component</sub></center>
 
 **API** : [`Model.java`](../src/main/java/seedu/manager/model/Model.java)
 
@@ -172,7 +172,7 @@ The `Model`,
 
 <img src="images/StorageClassDiagram.png" width="800">
 
-<center><sub>Fig 9: Class Diagram for Storage component</sub></center>
+<center><sub>Fig 8: Class Diagram for Storage component</sub></center>
 
 **API** : [`Storage.java`](../src/main/java/seedu/manager/storage/Storage.java)
 
@@ -182,7 +182,7 @@ The `Storage` component,
 
 ### Common classes
 
-Classes used by multiple components are in the `seedu.manager.commons` package.
+Classes used by multiple components are in the [`seedu.manager.commons`](#../src/main/java/seedu/manager/commons) package.
 
 
 ## Implementation
@@ -463,7 +463,7 @@ We researched other task managers' special features to better understand the pro
 1. The command line mode of Wunderlist
 2. Uses natural words as commands, content is put inside single quotes
 3. Data can be exported as a JSON file
-4. Allows searching by keywords (doesn't need single quotes).
+4. Allows searching by keywords (doesn't need single quotes)
 
 ##### Calendar Vim
 1. A calendar application for Vim