Fix minor problems in Developer Guide

docs/DeveloperGuide.md

@@ -89,7 +89,7 @@ The sequence diagram below illustrates the interactions within the `Logic` compo
 
 ![Interactions Inside the Logic Component for the `delete 1` Command](images/DeleteSequenceDiagram.png)
 
-<b markdown="span" class="alert alert-info">:information_source: <b>Note:</b> The lifeline for `DeleteCommandParser` should end at the destroy marker (X) but due to a limitation of PlantUML, the lifeline continues till the end of diagram.
+<div markdown="span" class="alert alert-info">:information_source: **Note:** The lifeline for `DeleteCommandParser` should end at the destroy marker (X) but due to a limitation of PlantUML, the lifeline continues till the end of diagram.
 </div>
 
 How the `Logic` component works:
@@ -226,7 +226,7 @@ Given below is an example usage scenario and how the edit patient feature behave
 **Step 3.** A new `EditPersonDescriptor` object is created with the new ward details. 
 A new `EditCommand` instance will be created with the index of the patient to be edited and the new `EditPersonDescriptor` object.
 
-**Step 4.** The `EditCommand` instace is returned to the `LogicManager` and `execute` is called.
+**Step 4.** The `EditCommand` instance is returned to the `LogicManager` and `execute` is called.
 
 **Step 5.** The `EditCommand` instance calls `Model#setPerson(Person, Person)` to edit the patient's details.
 The patient specified will have its ward updated to the new ward specified.

docs/diagrams/AddSequenceDiagram.puml

@@ -43,7 +43,7 @@ destroy AddCommandParser
 AddressBookParser --> LogicManager
 deactivate AddressBookParser
 
-LogicManager -> AddCommand : execute(model)
+LogicManager -> AddCommand : execute(m)
 activate AddCommand
 'add parameters of add command here; replace '1''
 AddCommand -> Model : addPerson(person)

docs/diagrams/DeleteActivityDiagram.puml

@@ -5,7 +5,7 @@ start
 : User enters delete command;
 : LogicManager executes user input;
 : AddressBookParser parses delete command;
-: DeleteCommandParser  parses the arguments provided in add command;
+: DeleteCommandParser parses the arguments provided in add command;
 if() then ([valid index])
 : AddressBookManager deletes the contact;
 else ([else])

docs/diagrams/ModelClassDiagram.puml

@@ -40,7 +40,7 @@ Person *--> "1" Ic
 Person *--> "1" AdmissionDate
 Person *--> "1" Dob
 Person *--> "1" Ward
-Person *--> "1" Remark
+Person *--> "0..1" Remark
 Person *--> "*" Tag
 
 Person -[hidden]up--> I