Pull Request: C4_Lin_425_View_Corrected_Assignment_4.26

<b>For scenario reviewers</b>

sign in as "1@student.com"
navigate to courses and then to course 'data structures and algorithms'
click on check grades to check the grades and if the assignment is corrected you can view the correction noted by the TA.

<b>For test reviewers</b>
bundle exec rspec spec/controllers/assignments_controller_spec.rb

@rami-khalil @Sharaf93 @mohamedsaeed93 @fadel1493 @mimikian  Can you please review. Thanks