:pencil2: Fix minor grammatical mistakes in the async docs (#1188)
:pencil2: Fix minor grammatical mistakes in the async docs (#1188)

* Fix minor grammatical mistakes in the async docs.

* :pencil2: Update wording and clarify with emojis

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