✏ Fix typo in FastAPI tutorial (#192)

Author: yaquelinehoyos

docs/tutorial/fastapi/simple-hero-api.md

@@ -152,7 +152,7 @@ It will be called when a user sends a request with a `POST` **operation** to the
 
 ## The **SQLModel** Advantage
 
-Here's where having our **SQLModel** class models be both **SQLAlchemy** models and **Pydantic** models at the same tieme shine. ✨
+Here's where having our **SQLModel** class models be both **SQLAlchemy** models and **Pydantic** models at the same time shine. ✨
 
 Here we use the **same** class model to define the **request body** that will be received by our API.