Fix up the docs warning detected by the vale Admin rule
What does this MR do and why?
This MR aims to solve the issue #276198 (closed)
File Change
- doc/development/cascading_settings.md
- doc/development/import_project.md
- doc/development/testing_guide/end_to_end/feature_flags.md
- doc/development/testing_guide/end_to_end/running_tests_that_require_special_setup.md