Clarify same as course relationship UI

[rmainwork]

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• [x] I have run eslint on the code
• [x] I have added JSDoc for all of my code (where applicable)
• [x] I have added tests to cover my changes.

Priority:

• [x] Normal
• [ ] High

Related Issues:

Fixes #637

[codecov[bot]]

Codecov Report

Merging #661 (e59e8e2) into develop (b293fcf) will decrease coverage by 0.06%. The diff coverage is 91.66%.

:exclamation: Current head e59e8e2 differs from pull request most recent head 599f4a6. Consider uploading reports for the commit 599f4a6 to get more accurate results

@@             Coverage Diff             @@
##           develop     #661      +/-   ##
===========================================
- Coverage    94.19%   94.14%   -0.06%     
===========================================
  Files          195      196       +1     
  Lines         4602     4612      +10     
  Branches       567      568       +1     
===========================================
+ Hits          4335     4342       +7     
- Misses         149      150       +1     
- Partials       118      120       +2     

Impacted Files	Coverage Δ
...rc/client/components/pages/Courses/CourseModal.tsx	87.96% <80.00%> (-0.39%)	:arrow_down:
src/client/components/App.tsx	96.77% <100.00%> (-0.11%)	:arrow_down:
src/client/components/layout/CustomFooter.tsx	100.00% <100.00%> (ø)
src/client/components/layout/index.ts	100.00% <100.00%> (ø)
src/server/course/course.controller.ts	94.33% <100.00%> (+0.10%)	:arrow_up:

... and 2 files with indirect coverage changes

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