Fixed small mistake (#4104)

entity-framework/core/testing/testing-without-the-database.md

@@ -42,7 +42,7 @@ The full sample code can be viewed [here](https://github.com/dotnet/EntityFramew
 
 SQLite can easily be configured as the EF Core provider for your test suite instead of your production database system (e.g. SQL Server); consult the [SQLite provider docs](xref:core/providers/sqlite/index) for details. However, it's usually a good idea to use SQLite's [in-memory database](https://sqlite.org/inmemorydb.html) feature when testing, since it provides easy isolation between tests, and does not require dealing with actual SQLite files.
 
-To use in-memory SQLite, it's important to understand that a new database is created whenever a low-level connection is opened, and that it's deleted what that connection is closed. In normal usage, EF Core's `DbContext` opens and closes database connections as needed - every time a query is executed - to avoid keeping connection for unnecessarily long times. However, with in-memory SQLite this would lead to resetting the database every time; so as a workaround, we open the connection before passing it to EF Core, and arrange for it to be closed only when the test completes:
+To use in-memory SQLite, it's important to understand that a new database is created whenever a low-level connection is opened, and that it's deleted when that connection is closed. In normal usage, EF Core's `DbContext` opens and closes database connections as needed - every time a query is executed - to avoid keeping connection for unnecessarily long times. However, with in-memory SQLite this would lead to resetting the database every time; so as a workaround, we open the connection before passing it to EF Core, and arrange for it to be closed only when the test completes:
 
 [!code-csharp[Main](../../../samples/core/Testing/TestingWithoutTheDatabase/SqliteInMemoryBloggingControllerTest.cs?name=ConstructorAndDispose)]