refactor: update method visibility in class diagram for clarity

lab2/README.md

@@ -37,8 +37,8 @@ classDiagram
         + contact_present() : Boolean
         + get_first_contact() : String
         + git=(git : String) : void
-        - validate_id(id: String) : void <<class>>
-        - validate_git(git : String) : void <<class>>
+        + validate_id(id: String) : void <<class>>
+        + validate_git(git : String) : void <<class>>
         - valid_git?(git : String) : Boolean
         - valid_id?(id : String) : Boolean
     }
@@ -50,6 +50,7 @@ classDiagram
 
     class StudentShort {
         - surname_initials : String
+        + get_surname_initials() : String
         + StudentShort(id : String, surname_initials : String, phone: String, telegram: String, email: String)
         + from_student(student : Student) : StudentShort <<class>>
         + from_string(id : String, info_string : String) : StudentShort <<class>>