Fix scoped labels test cases descriptions

What does this MR do?

Fix scoped labels test cases descriptions based on their expectations

Does this MR meet the acceptance criteria?

Conformity

• [-] Changelog entry
• [-] Documentation created/updated or follow-up review issue created
• Code review guidelines
• [-] Merge request performance guidelines
• Style guides
• [-] Database guides
• Separation of EE specific content

@jprovaznik, I also would like to know if the test 'preserves multiple exclusive scoped labels when only removing labels' from the scoped_label_examples.rb file is correct since I don't see where the removal happens. Please let me know if any change is needed here as well.