✏ Re-word to clarify test client in `docs/en/docs/tutorial/testing.md` (#3382)
✏ Re-word to clarify test client in `docs/en/docs/tutorial/testing.md` (#3382)

Co-authored-by: Sebastián Ramírez <668e2a3febf6a4b75056e840735926407962bc4e@gmail.com>
tiangolo/fastapi,tiangolo/fastapi,tiangolo/fastapi