📝 Update location of get_db in SQL docs (#1293)

docs_src/sql_databases/sql_app/main.py

@@ -13,8 +13,8 @@ app = FastAPI()
 
 # Dependency
 def get_db():
+    db = SessionLocal()
     try:
-        db = SessionLocal()
         yield db
     finally:
         db.close()