refactor: give the exact name

Domain/Schedule/LessonAssociation.cs

@@ -1,11 +1,10 @@
 namespace Mirea.Api.DataAccess.Domain.Schedule;
 
-public class ProfessorToLesson
+public class LessonAssociation
 {
     public int Id { get; set; }
     public string? LinkToMeet { get; set; }
 
-
     public int LessonId { get; set; }
     public Lesson? Lesson { get; set; }
     public int? ProfessorId { get; set; }