fix: broken links in use case readme for multitenant apps

[lechnerc77]

Purpose

• fix broken links in use case files

Does the PR solve an issue

[X] Yes - #541
[ ] No

Does this introduce a breaking change?

[ ] Yes
[X] No

Pull Request Type

What kind of change does this Pull Request introduce?

[X] Bugfix
[ ] Feature
[ ] Code style update (formatting, local variables)
[ ] Refactoring (no functional changes, no api changes)
[X ] Documentation content changes
[ ] Other... Please describe:

How to Test

n/a

What to Check

n/a

Other Information

n/a