Edit method header comments

src/main/java/seedu/address/model/person/Person.java

@@ -75,25 +75,29 @@ public boolean isSamePerson(Person otherPerson) {
     }
 
     /**
-     * Returns true if both person have the same email address.
-     * This is to check for duplicates in emails in the contact list.
+     * Checks for duplicates in emails in the contact list.
+     * @param otherPerson The Person object to compare against.
+     * @return True if both persons have the same email address.
      */
     public boolean hasSameEmail(Person otherPerson) {
         return otherPerson != null && otherPerson.getEmail().equals(this.getEmail());
     }
 
     /**
-     * Returns true if two contacts share the same phone number.
      * Checks for duplicates in phone numbers in the contact list.
+     * @param otherPerson The Person object to compare against.
+     * @return True if both persons have the same phone number.
      */
     public boolean hasSamePhoneNumber(Person otherPerson) {
         return otherPerson != null && otherPerson.getPhone().equals(this.getPhone());
     }
 
     /**
-     * Returns true if two contacts are considered as duplicates.
-     * This is to avoid adding duplicate contact in the contact list.
-     *
+     * Checks for duplicated contact information between Person instances.
+     * This is to avoid adding duplicate contacts in the contact list.
+     * Checked fields: name, phone, email.
+     * @param otherPerson The Person object to compare against.
+     * @return True if two contacts are considered as duplicates.
      */
     public boolean hasDuplicateInfo(Person otherPerson) {
         return this.isSamePerson(otherPerson)